Answer: , the work required to separate the two ions to an infinite distance is 4.63 x 10^-19 J.
Explanation: One can determine the potential energy of two point charges by utilizing the specified equation:
The value of U is directly proportional to the product of q1 and q2, and inversely proportional to the distance between them (r), where k is a constant factor.
The potential energy denoted by U is determined by the Coulomb constant, k, which has a value of 9 x 10^9 Nm^2/C^2. The calculation of U involves the charges of two particles, q1 and q2, as well as the distance between them, denoted by r.
We have an instance where a sodium ion (Na+) has a charge of 1.6x10^-19 C, and a chloride ion (Cl-) has a charge of -1.6x10^-19 C, positioned 4.95 Nm apart from each other.
Once we insert the given numbers, the result obtained is:
The expression for U can be obtained by utilizing the equation U = (kQq)/r, with k being the Coulomb's constant equal to 9 x 10^9 Nm^2/C^2, Q and q representing the electric charges of -1.6x10^-19 C and -1.6x10^-19 C, respectively, and r being the distance between the charges of 4.95 Nm.
The value of U is negative 4.63 times 10 to the power of negative 19 Joules.
It is important to observe that the negative symbol signifies the negativity of the potential energy, implying that effort must be exerted in order to disassociate the two ions.
0.12g of compound "Y" dissolves in 10mlof acetone at 25 degree celsuis and 0.85g of the same compound dissolves in 10ml of boiling acetone. what volume of acetone would be required to purify a 5.0g sample of compound?
The volume of acetone would be required to purify a 5.0g sample of compound is 58.82ml
Volume calculation.
Let use the solubility data of acetone provided to calculate the volume.
First we will need to calculate the solubility of Y in 25 degree.
Solubility of Y= 0.12g/10ml= 0.012g/ml.
Solubility of y in boiling acetone = 0.85g/10ml =0.085g/ml.
In order to purify y, we need to dissolve the amount of y in the 5.0g sample.
The amount of acetone needed to dissolve y in the sample is
amount acetone= mass of y/ solubility of y in boiling acetone.
amount acetone= 5.0g/0.085g/ml= 58.82ml.
Therefore, the volume of acetone would be required to purify a 5.0g sample of compound is 58.82ml
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Consider this unbalanced equation: Na₂Cr₂O7+ HCI → CrCl3 + NaCl + Cl₂ + H₂O
a. If we introduce 12g of HCl into this equation, how many moles of sodium
chloride are produced?
b. If we introduce 2.1 moles of sodium dichromate into this reaction, how many
moles of chromium (III) chloride are produced?
a. On introducing 12g of HCl, 0.047 moles of sodium chloride are produced and b. On introducing 2.1 moles of sodium dichromate, 4.2 moles of chromium (III) chloride are produced.
How to calculate number of moles of a molecule?Number of moles = Mass of the molecule (in grams) / Molar mass of the molecule (in grams per mole)
a. To solve this problem, we need to balance the chemical equation first:
Na₂Cr₂O7 + 14HCl → 2CrCl₃ + 2NaCl + 7Cl₂ + 7H₂O
The balanced equation shows that for every 14 moles of HCl, 2 moles of NaCl are produced.
So, to find the number of moles of NaCl produced from 12g of HCl, we first need to convert grams to moles using the molar mass of HCl.
Molar mass of HCl = 1.008 + 35.453 = 36.461 g/mol
Number of moles of HCl = mass / molar mass = 12g / 36.461 g/mol = 0.329 mol
Now, we can use the mole ratio from the balanced equation to find the number of moles of NaCl produced:
2 moles NaCl / 14 moles HCl * 0.329 mol HCl = 0.047 moles NaCl
Therefore, 0.047 moles of sodium chloride are produced.
b. Using the balanced equation from part a, we can see that the mole ratio between sodium dichromate and chromium (III) chloride is 1:2.
So, if 2.1 moles of sodium dichromate are introduced, we can find the number of moles of chromium (III) chloride produced by multiplying the number of moles of sodium dichromate by the mole ratio:
2.1 moles Na₂Cr₂O₇ * 2 moles CrCl₃ / 1 mole Na₂Cr₂O₇ = 4.2 moles CrCl₃
Therefore, 4.2 moles of chromium (III) chloride are produced.
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I WILL GIVE 35 POINTS TO THOSE WHO ANSWER THIS QUESTION RIGHT NOOOO SCAMS PLEASE
The molarity of the solution is 0.0156 M (or mol/L).
Does Iron(III) nitrate precipitate out as a solid?More precisely, a solution of iron(III) nitrate, will react with a solution of sodium hydroxide, to generate iron(III) hydroxide, which precipitates out of solution. The insoluble solid is not shown as ions, as you will see.
The molar mass of Iron(III) nitrate is:
Iron: 1 atom x 55.85 g/mol = 55.85 g/mol
Nitrogen: 3 atoms x 14.01 g/mol = 42.03 g/mol
Oxygen: 9 atoms x 16.00 g/mol = 144.00 g/mol
Total molar mass is equal to 241.88 g/mol (55.85 + 42.03 + 144.00).
So, the number of moles of Iron(III) nitrate in 8.55 g is:
moles = mass/molar mass = 8.55 g/241.88 g/mol = 0.0353 mol
The solution's volume in litres must then be determined. 2.26 L is listed as the volume.
The unit of measurement for molarity is moles of solute per litre of solution.
Molarity = 0.0353 mol / 2.26 L = 0.0156 M
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Choose the properties that the following element may have based n its location in the periodic table.
Magnesium (Mg):
- dull
- less reactive than sodium
- a gas
How much heat, in kJ, is required to melt 13.3 g of ice at 0°C in water at 0°C if ΔHfus for water = 6.01 kJ/mol?
The amount of heat required to melt 13.3 g of ice at 0°C in water at 0°C is approximately 4.43 kJ.
What is Heat?
Heat is a form of energy that is transferred between objects or systems as a result of a temperature difference. It is a form of energy associated with the motion of particles, such as atoms and molecules, within a substance. Heat energy is responsible for changing the temperature of a substance or causing phase transitions, such as melting, boiling, or condensing.
Given:
Mass of ice (m) = 13.3 g
ΔHfus for water = 6.01 kJ/mol
First, we need to convert the mass of ice from grams to moles, using the molar mass of water. The molar mass of water (H2O) is:
2(atomic mass of hydrogen) + atomic mass of oxygen
= 2(1.008 g/mol) + 15.999 g/mol
= 18.015 g/mol
So, moles of ice (n) = mass of ice (m) / molar mass of water
= 13.3 g / 18.015 g/mol
= 0.7386 mol
Now, we can use the formula to calculate the heat required:
Q = m * ΔHfus
= 0.7386 mol * 6.01 kJ/mol
= 4.43 kJ (rounded to two decimal places)
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what happens to the egg salad sandwich once inside the students body
The pH of the student's stomach acid can affect the egg salad sandwich once inside the student's body in several ways. When the sandwich enters the stomach, the hydrochloric acid (HCl) present in the stomach acid starts to break down the proteins and other components of the sandwich.
The optimal pH range for the activity of the digestive enzyme pepsin, which breaks down protein, is between pH 1.5 and 2.5, so the acidic environment of the stomach acid is necessary for proper digestion of the sandwich. Additionally, the acidic environment of the stomach can denature and break down any harmful bacteria that might be present in the sandwich, reducing the risk of foodborne illness.
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--The complete Question is, How does the pH of the student's stomach acid affect the egg salad sandwich once inside the student's body? --
2H2O(l) --> 2H2(g) + O2(g), How many moles of H2O are required to yield 22.4 L of O2 at STP?
To produce 22.4 L of O2 at STP, we need 2 moles of H2O.
What is Standard temperature and pressure ?Standard temperature and pressure (STP) is a set of reference conditions used in chemistry and physics. It is defined as a temperature of 0 degrees Celsius (273.15 Kelvin) and a pressure of 1 atmosphere (760 mmHg or 101.3 kPa). At STP, 1 mole of any ideal gas occupies a volume of 22.4 liters.
The balanced chemical equation is :
2H2O(l) → 2H2(g) + O2(g)
From the equation, we can see that for every 2 moles of H2O, 1 mole of O2 is produced.
At STP (standard temperature and pressure), 1 mole of any ideal gas occupies 22.4 L.
Therefore, to produce 22.4 L of O2 at STP, we need 2 moles of H2O.
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80.0 grams of potassium sulfate is dissolved in 320 grams of water. Find the percentage concentration
The percentage concentration of potassium sulfate in the solution is 20%.
What is Percentage Concentration?
Percentage concentration, also known as percent concentration or mass percent, is a measure of the amount of a solute present in a solution, expressed as a percentage of the total mass or volume of the solution. It is commonly used in chemistry and related fields to express the concentration of a solute in a solution.
To find the percentage concentration of potassium sulfate in the solution, we need to calculate the mass of potassium sulfate in the solution and express it as a percentage of the total mass of the solution.
Given:
Mass of potassium sulfate (K2SO4) = 80.0 g
Mass of water (H2O) = 320 g
Total mass of the solution = Mass of potassium sulfate + Mass of water
= 80.0 g + 320 g
= 400 g
Now, we can calculate the percentage concentration of potassium sulfate:
Percentage concentration = (Mass of potassium sulfate / Total mass of the solution) × 100
Percentage concentration = (80.0 g / 400 g) × 100
= 20%
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the question says “preform the following unitless calculations and round the final answer to the proper number of significant figures. Assume that all the numbers came from measurements” Please help me I don’t understand
Unitless calculations and rounding the final answer to the proper number of significant figures : a) 3.323 b) 5.8 c) 42.02 d) 15.7025
What is meant by significant figures?Significant figures represent the meaningful and reliable digits in a number.
a) 3.41 - 0.086652 = 3.323348
Since both numbers have four significant figures, the final answer should also have four significant figures. Therefore, rounding the final answer to four significant figures gives: 3.323
b) 17.441 / 3 = 5.813666666666666
The least precise value in this calculation is 3, which has only one significant figure. Therefore, rounding the final answer to one significant figure gives: 5.8
c) 21.01 * 2 = 42.02
Both numbers have four significant figures, so the final answer should also have four significant figures. Therefore, the final answer is: 42.02
d) 18.7644 - 3.472 + 0.4101 = 15.7025
All three numbers have five significant figures, so the final answer should also have five significant figures. Therefore, the final answer is: 15.7025.
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when 1.24g of an oxygenated hydrocarbon is burned in excess oxygen, 1.76g of carbon dioxide and 1.08g of water vapor are obtained. what is the empirical formula of the compound?
The empirical formula of the oxygenated hydrocarbon is CH2O.
To find the empirical formula of the oxygenated hydrocarbonWe need to determine the mole ratios of the elements present in the compound using the given masses and the molar masses of the elements.
First, we need to find the moles of carbon dioxide and water vapor produced in the reaction:
moles of CO2 = 1.76 g / 44.01 g/mol = 0.0400 mol CO2
moles of H2O = 1.08 g / 18.02 g/mol = 0.0599 mol H2O
Next, we need to find the moles of carbon and hydrogen in the compound. We can do this by using the masses of carbon dioxide and water vapor produced, the molar masses of the elements, and the balanced chemical equation for the combustion of hydrocarbons:
CxHyOz + (x + y/4 - z/2) O2 -> x CO2 + (y/2) H2O
From the balanced equation, we can see that the mole ratio of carbon to carbon dioxide is 1:1, and the mole ratio of hydrogen to water vapor is (1/2):(1/2) or 1:1. Therefore:
moles of C = moles of CO2 = 0.0400 mol CO2
moles of H = 2 × moles of H2O = 0.1198 mol H2O
Finally, we can find the mole ratio of carbon to hydrogen in the compound:
mol ratio of C to H = (moles of C) / (moles of H) = 0.0400 mol CO2 / 0.1198 mol H2O ≈ 0.334
To get whole numbers for the mole ratio, we can multiply both sides by a common factor, such as 3:
mol ratio of C to H ≈ 0.334 ≈ 1/3
mol ratio of C to H = 1
mol ratio of O to H = (moles of O) / (moles of H) = (moles of CxHyOz - moles of C - moles of H) / (moles of H) = (0.0400 mol CO2 + 0.0599 mol H2O - 0.0400 mol C - 0.1198 mol H) / 0.1198 mol H = 0.213
To get whole numbers for the mole ratio, we can multiply both sides by a common factor, such as 5:
mol ratio of O to H ≈ 0.213 ≈ 2/9
mol ratio of O to H = 2
Therefore, the empirical formula of the oxygenated hydrocarbon is CH2O.
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A phosphoric acid (H3PO4) solution is 14.8 M with a density of 1.71 g/mL.
a) Determine the molality of the solution.
b) Determine the percent by mass of H3PO4 in the solution.
The volume of a sample of a gas at 0°C is 100 liters. If the volume of the gas is increased to 200 liters at constant pressure, what is the new temperature of the gas, in K?
The new temperature of a sample of gas initially at 0°C and contains 100L is 546K.
How to calculate temperature?The temperature of a gas can be calculated using the Charles' law equation as follows:
V₁/T₁ = V₂T₂
Where;
V₁ and T₁ = initial volume and temperatureV₂ and T₂ = final volume and temperatureAccording to this question, the volume of a sample of a gas at 0°C is 100 liters. If the volume of the gas is increased to 200 liters at constant pressure, the new temperature is as follows:
100/273 = 200/T₂
200 × 273 = 100T₂
T₂ = 546K
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Listen A gas mixture contains O2. N₂, and Ar at partial pressures of 100, 150, and 200 torr, respectively. If CO2 gas is added to the mixture until the total pressure reaches 575 torr, what is the partial pressure of the CO₂? 575 torr 125 torr 450 torr 0.50 M E
We can start by using Dalton's Law of Partial Pressures, which states that the total pressure of a gas mixture is equal to the sum of the partial pressures of each individual gas component.
Let PCO2 be the partial pressure of CO2 in the mixture after it is added. Then, we can set up the following equation:
PO2 + PN2 + PAr + PCO2 = Ptotal
Substituting in the given partial pressures and total pressure, we get:
100 torr + 150 torr + 200 torr + PCO2 = 575 torr
Simplifying the equation, we get:
PCO2 = 575 torr - 100 torr - 150 torr - 200 torr
PCO2 = 125 torr
Therefore, the partial pressure of CO2 in the gas mixture is 125 torr. Answer: B) 125 torr.
If 355 mL of 0.325 M Pb(NO;)2 (molar mass 331.2 g/mol) is added to 255 mL of 0.225 M K,POA, (molar
mass 212.27 g/m), how many grams of Pb, (PO4)2 (molar mass 811.54 g/mol) precipitate will be formed? The
balanced equation is
3 Pb(NO;) (ag) + 2 K,PO, (ag) -> Pb, (POA)2 (S) + 6 KNO; (ag)
0.0385 mol
0.0287 mol
31.2 g
23.3 g
46.6 g
If 355 mL of 0.325 M Pb(NO)₂ (molar mass 331.2 g/mol) is added to 255 mL of 0.225 M K₃PO₄, (molar mass 212.27 g/m), 2.57 grams of Pb(PO₄)₂ (molar mass 811.54 g/mol) precipitate will be formed.[tex]\frac{355ml * 0.325M}{331.2 g/ml}[/tex]
What is precipitation reaction?The word "precipitation reaction" refers to a "chemical reaction occurring in an aqueous solution where two ionic bonds combine, yielding the formation of an insoluble salt." The insoluble salts produced by precipitation reactions are known as precipitates. The precipitate, a solid type of residue, is formed during precipitation reactions, which are frequently double displacement processes. When two or more solutions with different salt concentrations are combined, these reactions lead to the formation of insoluble salts that precipitate out of the solution.
One of the best examples of a precipitation reaction is the chemical interaction between potassium chloride and silver nitrate, which results in the precipitation of solid silver chloride. The insoluble salt is a result of the precipitation reaction.
The number of grams of Pb(PO4)2 precipitate that is formed can be calculated using the following equation:
Moles Pb(NO₃)₂ x Molar Mass Pb(PO₄)₂ / Moles K₃PO₄ = Grams of Pb(PO₄)₂
So the calculation is:
[tex]\frac{355ml * 0.325M}{331.2 g/ml}[/tex] x [tex]\frac{811.54g/mol}{255ml * 212.27g/mol}[/tex]) = 2.57 g Pb(PO₄)₂
Therefore, 2.57 g of Pb(PO₄)₂will be formed when 355 mL of 0.325 M Pb(NO₃)₂ and 255 mL of 0.225 M K₃PO₄ is mixed.
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Why will the results be slow for test on the possible solutions for decreasing the impact of human activities on the ocean shores zones?
A. It will be slow because you will have to wait for control
B. It will be slow because you will have to wait for natural processes to affect each area
C. It will be slow because you will have to wait for more human activity within the area
D.It will be slow because you will have to wait to build sand dunes
B. It will be slow because you will have to wait for natural processes to affect each area.
What is Ocean?
An ocean is a vast body of saltwater that covers more than 70% of the Earth's surface. Oceans are the largest bodies of water on our planet and are essential for supporting life on Earth. Oceans play a crucial role in regulating the Earth's climate, absorbing heat and carbon dioxide, and generating oxygen.
The impact of human activities on ocean shores zones, such as coastal development, pollution, and overfishing, can have long-lasting and sometimes irreversible effects on these ecosystems. Restoring or mitigating the impacts of human activities on ocean shores zones requires time and effort, as natural processes need to take place to restore the affected areas.
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What is the volume of a 3.00 M solution made with 4.70 moles of LIF?
Consequently, 1.57 litres is the volume of a 3.00 M solution prepared using 4.70 moles of LIF.
Why is 1.5 M solution important?Probably the most often used unit of measurement for solution concentration is molarity, abbreviated as (M). The ratio of the number of litres of solution to the number of moles of solvent is known as molarity. For instance, we may use the terms "1.5 molar solution" or "1.5 M" to describe a solution.
To calculate the volume of a 3.00 M solution made with 4.70 moles of LIF, we can use the formula:
Molarity is equal to the moles of solute times the litres of solution.
Rearranging the formula to solve for the volume of the solution, we get:
Volume of solution = moles of solute ÷ (Molarity x 1000)
Where 1000 is the conversion factor from milliliters to liters.
Plugging in the values given, we get:
Volume of solution = 4.70 moles ÷ (3.00 mol/L x 1000)
Volume of solution = 1.57 L
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PLS help ill mark you as brainlist
High-pressure liquid chromatography (HPLC) is a method used in chemistry and biochemistry to purify chemical substances. The pressures used in this procedure range from around 500 kilopascals (500,000 Pa ) to about 60,000 kPa (60,000,000 Pa ). It is often convenient to know the pressure in torr. If an HPLC procedure is running at a pressure of 2.09×108 Pa, what is its running pressure in torr?
Express the pressure numerically in torr.
The running pressure of the HPLC procedure in torr is approximately 2068.2687 torr.
What is Chromatography?
Chromatography is a technique used to separate, identify, and analyze the components of a mixture based on their differential affinities to a stationary phase and a mobile phase. It is widely used in chemistry, biochemistry, pharmaceuticals, environmental science, forensics, and other fields for purification, separation, and analysis of chemical compounds.
To convert pressure from pascals (Pa) to torr, we can use the following conversion:
1 torr = 101325 Pa
So, to convert the pressure from pascals to torr, we can divide the pressure in pascals by 101325.
Given:
Pressure in pascals (Pa) = 2.09 × [tex]10^{8}[/tex] Pa
Using the conversion factor:
Pressure in torr = (2.09 × [tex]10^{8}[/tex]Pa) / 101325 Pa/torr
Calculating the numerical value in torr:
Pressure in torr = 2068.2687 torr (rounded to four decimal places)
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Refer to picture for question, all must be answered to be considered for Brainliest!!!
Li₃PO₄ + 3 Zn(NO₃)₂ → 3 LiNO₃ + Zn₃(PO₄)₂. In this balanced equation, one of the products is Zn₃(PO₄)₂. To ensure that the equation is balanced, we need 3 moles of Zn(NO₃)₂ for every 1 mole of Li₃PO₄.
What is product in any given reaction?In a chemical reaction, a product is a substance that is formed as a result of the chemical reaction. It is the end result of a chemical reaction, and it is produced by the rearrangement of atoms and/or ions of the reactants.
In the given equation, we end up with 1 mole of Zn₃(PO₄)₂ for every 3 moles of Zn₃(PO₄)₂. This means that the molar ratio of Zn₃(PO₄)₂ to Zn₃(PO₄)₂ is 1:3, indicating that we need three times as much Zn₃(PO₄)₂ as Zn₃(PO₄)₂ to balance the equation. Therefore, one of the products, Zn₃(PO₄)₂, must be produced in a smaller quantity than the other product, LiNO₃.
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Water in a truck's radiator can get hotter than 100 °C when the radiator is sealed tightly. How is it possible for water to exist as a liquid at temperatures above its normal boiling point?
1c. A car drives 464 km in 4 hours. What is its average speed in kilometers per hour? Please SHOW YOUR WORK and INCLUDE UNITS!
Looking for km/hr
The car's average speed is 116 kilometers per hour.
The entire distance traveled divided by the total time elapsed is the definition of average speed. It is typically stated in terms of the amount of time or distance per unit, such as meters per second (m/s) or kilometers per hour (km/hr).
Average speed = total distance ÷ total time
In this case, the total distance is 464 km and the total time is 4 hours.
Average speed = 464 km ÷ 4 hours
Average speed = 116 km/hr
Therefore, the car's average speed is 116 kilometers per hour.
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25.
A 500.0-gram sample of copper is initially at 25 °C. It absorbs 6.30 kJ of heat from its surroundings. What is
its final temperature, in °C? (Specific heat = 0.385 J/g °C for copper)
57.7 °C
41.4 °C
7.72 °C
65.7 °C
29 9 °C
The final temperature with Specific heat = 0.385 J/g °C for copper is 57.7 °C.
What is Specific heat?Specific heat is a measure of the amount of heat energy required to raise the temperature of a unit mass of a substance. It is a physical property of a material and is usually measured in units of J/(g °C) or J/(g K).
Equation:q = m * c * ΔT
where q is the heat absorbed (in joules), m is the mass of the substance (in grams), c is the specific heat (in J/(g °C)), and ΔT is the change in temperature (in °C).
Plugging in the values,
6.30 kJ = 500.0 g * 0.385 J/(g °C) * ΔT
Simplifying the equation, we get:
ΔT = (6.30 kJ) / (500.0 g * 0.385 J/(g °C))
ΔT = 32.7 °C
The final temperature of the copper is as follows:
25 °C + 32.7 °C = 57.7 °C
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O Macmillan Learning
What is the IUPAC name for the compound shown?
IUPAC name:
The compound shown has the IUPAC name O Macmillan Learning. -3-ethyl-2,2-dimethyl-hexane Incorrect.
Why was 1 6 dimethylhexane wrong?Explanation and response: Because it implies that there's methyl groups on carbons number one and sixth of the parent carbon chain, the name — appears-dimethylhexane is incorrect. Because the name "hexane" implies that a parent atom chain only has six molecules long, the methyl groups are located at the ends of every molecule.
Is hexane considered an organic chemical?Hexane, commonly referred to as sextane, is an organic compound that belongs to the alkane class. They are acyclic branched as well unbranched hydrocarbons with the standard structure CnH2n+2, and thus entirely composed of hydrogen and saturated oxygen atoms. Hexane is a colorless, clear liquid.
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When 33.6 g of NO and 26.9 g of O, reacted together, the actual NO, product obtained was 20.2g, What was
the percent yield for the reaction?
2 NO (g) + O2 (g) -> 2 NO2 (g)
The percent yield for the reaction is 13.1%. it is the weight of the product that was obtained to the theoretical yield as a percentage.
What is revealed by the yield percentage?The percentage yield is the figure computed to represent the discrepancy between the theoretical yield and the actual yield of an experiment. Both the desired products and the by-products are produced when experimenting with various solutions or when preparing chemical solutions.
We must convert the amounts of NO and O2 to moles since 1 mol of NO reacts with 1/2 mol of O2:
moles of NO = 33.6 g / 30.01 g/mol = 1.12 mol
moles of O2 = 26.9 g / 32.00 g/mol = 0.84 mol
Since O2 is limiting, Our calculations will be based on the amount of oxygen present.
moles of NO2 = 0.84 mol O2 × (2 mol NO2 / 1 mol O2) × (2 mol NO / 1 mol NO2)
= 3.36 mol NO2
The molar mass of NO2 is 46.01 g/mol,
the theoretical yield in grams is:
mass of NO2 = 3.36 mol × 46.01 g/mol = 154.34 g
percent yield = (20.2 g / 154.34 g) × 100% = 13.1%
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Using the following reaction, determine the theoretical yield of Acetylsalicylic acid if given 2.31 grams of salicylic acid? (reminder, salicylic acid is the limiting reagent)
The theoretical yield of Acetylsalicylic acid is found out to be: 3.01 grams.
What is limiting reagent?The limiting reagent is a substance that prevents a chemical reaction from occurring completely.
When a limiting reagent is used in a chemical reaction, the atoms, molecules, or ions of the other reactant that it (the limiting reagent) reacts with will either stay free or unreacted.
What is acid?Popular compounds called acids and bases interact with one another to create salt and water. The Latin word "acere," which meaning "sour," is where the term "acid" originates.
According to the problem, we have 2.31 grams of salicylic acid. We need to determine the theoretical yield of acetylsalicylic acid.
The molar mass of salicylic acid is 138.12 g/mol. Therefore, the number of moles of salicylic acid we have is:
n = mass / molar mass
n = 2.31 g / 138.12 g/mol
n = 0.0167 mol
According to the balanced equation, 1 mole of salicylic acid reacts with 1 mole of acetic anhydride to produce 1 mole of acetylsalicylic acid. Therefore, the number of moles of acetylsalicylic acid produced is also 0.0167 mol.
The molar mass of acetylsalicylic acid is 180.16 g/mol. Therefore, the theoretical yield of acetylsalicylic acid is:
mass = n x molar mass
mass = 0.0167 mol x 180.16 g/mol
mass = 3.01 g
Therefore, the theoretical yield of acetylsalicylic acid is 3.01 grams.
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Part c moles of base in antacid sample
Mole base In antacid/mass of antacid sample
Average molole base in antacid/mass of antacid sample
An antacid tablet's CaCO content should be between 25 and 35% by mass.
To completely neutralise 20 ml of HCl solution, 19.85 ml of 0.01 M NaOH solution is required.
How many moles of NaOH are required for neutralisation?It is a neutralisation reaction in which sodium hydroxide, a basic, interacts with to form salt sodium phosphate, which is salt and water. According to the stoichiometric mole ratio, three moles of sodium hydroxide are needed to neutralise one mole of phosphoric acid.
To calculate the amount of moles of acid neutralised by the tablet, subtract the number of moles of acid neutralised in the titration from the starting solution's moles of acid.
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Device an experiment to study the dependence of rate ov precipitation of sulphur upon the nature of monobasic acid for the reaction between thiosulphate ion and hydrogen ion
The expected result of the experiment is that the rate of precipitation of sulfur will be faster with hydrogen chloride than with acetic acid.
What is Precipitation?
Precipitation refers to the process in which a substance in a solution comes out of solution and forms a solid. This occurs when the concentration of the substance exceeds its solubility limit in the solution, resulting in the formation of solid particles that settle at the bottom of the solution.
Procedure:
Prepare a series of solutions with different monobasic acids. For example, you can prepare solutions of sodium thiosulphate (Na2S2O3) with different monobasic acids, such as hydrochloric acid (HCl), sulfuric acid (H2SO4), and nitric acid (HNO3), at a constant concentration and volume.
Place equal volumes of the thiosulphate solution and each monobasic acid solution in separate beakers or test tubes.
Start the timer or stopwatch as soon as the two solutions are mixed. The thiosulphate ions will react with the hydrogen ions from the monobasic acid, resulting in the formation of sulphur precipitate according to the following chemical equation:
S2O3^2- + 2H+ -> H2O + S + SO2
Observe the reaction and record the time taken for the formation of sulphur precipitate in each solution.
Compare the rates of precipitation of sulphur for each monobasic acid solution to study the dependence of the rate on the nature of the monobasic acid. Note any trends or differences in the rates of precipitation among the different acids used.
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2Li + 1Fe(NO3)2 = 1Fe + 2LiNO3
How many moles of iron (II) nitrate would be needed to produce 4 moles of lithium nitrate?
Total, 2 moles of iron (II) nitrate would be needed to produce a 4 moles of lithium nitrate.
The balanced chemical equation for the reaction is;
2Li + 1Fe(NO₃)₂ → 1Fe + 2LiNO₃
From this equation, we can see that 2 moles of lithium nitrate are produced for every 1 mole of iron (II) nitrate used.
To determine how many moles of iron (II) nitrate are needed to produce 4 moles of lithium nitrate, we can use the mole ratio from the balanced equation;
moles of LiNO₃ = 4
moles of Fe(NO₃)₂ = (4 mol LiNO₃) x (1 mol Fe(NO₃)₂ / 2 mol LiNO₃)
= 2 mol Fe(NO₃)₂
Therefore, 2 moles of iron (II) nitrate is needed to produce 4 moles of lithium nitrate.
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Amount of CuO formed when 63.5 g of copper is heated strongly in air is:
The mass (in grams) of CuO formed when 63.5 g of copper, Cu is heated strongly in air is 79.5 g
How do I determine the mass of CuO formed?First, we shall write the balanced equation for the reaction, This is given below:
2Cu + O₂ -> 2CuO
Now, we shall determine the mass of CuO formed from the reaction. Details below:
Molar mass of Cu = 63.55 g/molMass of Cu from the balanced equation = 2 × 63.55 = 127.1 g Molar mass of CuO = 79.55 g/molMass of CuO from the balanced equation = 2 × 79.55 = 159.1 gFrom the balanced equation above,
127.1 g of Cu reacted to form 159.1 g of CuO
Therefore,
63.5 g of Cu will react to form = (63.5 × 159.1) / 127.1 = 79.5 g of CuO
Thus, the mass of CuO formed is 79.5 g
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Dilute laboratory bench reagents are generally 6.0 M. What volume of dilute HCI must be used to prepare 500 mL of 0.25 M HCI?
Answer:
Volume required ≈ 20.8 mL
Dilutions:When a solution is diluted, the total number of moles of solute (n), does not change. Only the total solution volume changes. As n=cV (molarity formula, where n = moles, c = concentration, V = volume), then the value of cV is a constant when diluting solutions. This can be expressed by the ratio:
c₁V₁ = c₂V₂, where subscripts 1 and 2 represent the concentrated and dilute solutions.
To dilute a solution of 6.0 M HCl to 0.25 M with a total volume of 0.500 L, we can use the dilution formula, where initial and final concentrations = 6.0 M and 0.25 M respectively, and final volume = 0.500 L (500 mL).
Hence, 6.0×V₁ = 0.25×0.500 = 0.125
V₁ = 0.125/6.0 = 0.02083 L
Therefore, the volume we require is ≈ 20.8 mL
a metal worker used a cutting torch that operated by reacting acetylene gas with oxygen gas, as shown in the unbalanced equation below. balance the following equation for the reaction of acetylene and oxygen, using the smallest whole-number coefficients. (the values are 1,2,3,4,5)
The balanced equation for the reaction of acetylene (C₂H₂) and oxygen (O₂) is; 2 C₂H₂(g) + 5 O₂(g) → 4 CO₂(g) + 2 H₂O(g) + heat
The coefficients in the balanced equation represent the stoichiometric ratio of the reactants and products in the chemical reaction. In this case, 2 molecules of acetylene (C₂H₂) react with 5 molecules of oxygen (O₂) to produce 4 molecules of carbon dioxide (CO₂) and 2 molecules of water (H₂O), along with the release of heat.
The balanced equation shows that the number of atoms of each element is the same on both the sides of the equation, in accordance with the law of conservation of mass.
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