The concentration of sodium chloride in units of weight/volume percent is 3.93g/ml
Given that
3.93 (w/v) NaCl
Weight NaCl = 3.14g
Volume of water = 79.9mL
W/V is usually represented in g/mL, so no need to change anything
3.14g/79.9mL *100 = 3.93 g/mL (%)
One mole of NaCl contains 6.022 x 10 23 NaCl formula units.
• Use the mole quantity to count formulas by weighing them.
• Mass of a mole of particles = mass of 1 particle x 6.022 x 1023
• The mass of an atom in amu is numerically the same
as the mass of one mole of atoms of the element in grams.
• One atom of sulfur has a mass of 32.07 amu;
one mole of S atoms has a mass of 32.07 g.
Mass of 1 H atom: 1.008 amu x 1.661 x10-24 g/amu = 1.674 x10-24 g
Mass of 1 mole of H atoms:
1.674 x10-24g/H atom x 6.022 x1023H atoms = 1.008 g
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What is the balanced form of the chemical equation shown below?
N₂(g) + H₂(g) → NH3(g)
OA. N₂(g) + 3H₂(g) → 2NH3(g)
OB. N₂(g) + H₂(g) → 2NH(g)
OC. N₂(g) + H₂(g) →
NH3(g)
OD. N₂(g) + H₂(g) → 2NH3(g)
The balanced form of the chemical equation shown is N₂(g) + 3H₂(g) → 2NH3(g) (option A).
What is a balanced equation?A chemical equation is said to be balanced when the number of atoms of each element on both sides of the equation is the same.
According to this question, the chemical equation between nitrogen and hydrogen is given as follows: N₂(g) + H₂(g) → NH3(g)
The balanced form of the chemical equation shown is N₂(g) + 3H₂(g) → 2NH3(g).
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Dna is made out of two strands of nucleotides that form a twisted ladder shape called a double helix. all of the following are part of a nucleotide except; a. deoxyribose sugar b. phosphate c. chromosomes d. nitrogen bases
Answer:
C.) Chromosomes
Explanation:
Nucleotides are made up of three parts: a deoxyribose sugar, a phosphate, and a nitrogen base.
Chromosomes are long, condensed strands of DNA.
An ideal gas at 20 degrees centigrade has a volume of 12 liters and a pressure of 15 atmospheres. Its temperature is raised to 35 degrees centigrade and compressed to a volume of 8.5 liters. Calculate the final pressure of the gas. (2 pts.)
P 15 atm
V₁ = 12x103 m3 -3 3 V₁ = 12x10 m" T₁ = 25°c T= 28815 K
P₁ = 1.52x10 Pa
Now, Finel quantities, T₂ = 35°C = 308.15 °K
V2= 851 = -3 3
Now
by ideal gas equation
P2Y2 T2
= PV, T2
1152 X106 x 12x16 3 x 308115 8,5×103 x 288,15 = Pa
=
21294×10 Pa
P₂ = 21264 Atm
final
pressure will be
21264 Adm.
Please check the attached file for a brief answer.
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How many grams are in 44.8 liters of nitrogen gas, n2?
a) 56g
b) 27g
c) 36g
d) 112g
Answer:
56 grams
Explanation:
44.8 L = 2 mol
Diatomic nitrogen has a formula mass of 28 g/mol, so 2 moles is 56 grams.
a) 56g
Calculation:At STP,
22.4 L of N₂ = 1 mol
We have given 44.8 L of N₂, therefore,
44.8 L of N₂ = [tex]\frac{44.8}{22.4}[/tex]
= [tex]2[/tex] mol
We know that,
1 mol of N₂ = 28 g
Hence,
2 mol of N₂ = 28 × 2
= 56g
Hence, there are 56 g of N₂ in 44.8 L of nitrogen gas.
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The substances generated by the reaction are called _______________, and their formulas are placed on the right side of the equation.
The substances generated by the reaction are called products, and their formulas are placed on the right side of the equation.
What is a Chemical Reaction ?A chemical reaction is a process in which chemical bonds between atoms to break and recognize, to form other new substances.
What is Product and Reactant in a chemical reaction ?The substance which is present at the left hand side or start of a chemical reaction is known as Reactant.
The substance which is present at the right hand side or end of a chemical reaction is known as Product.
Example: Na + Cl → NaCl
Here Na and Cl are on the left hand side of a reaction so Na and Cl are reactants. Here NaCl is on the right hand side of a reaction so NaCl is product.
Thus from the above conclusion we can say that The substances generated by the reaction are called products, and their formulas are placed on the right side of the equation.
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Naturally occuring element X exists in three isotopic forms: X-28 (27.730 amu, 60.58% abundance), X-29 (28.841 amu, 18.35% abundance), and X-32 (31.321 amu, 21.07% abundance). Calculate the average atomic weight of X. Please enter your answer to 4 significant figures.
The Average atomic weight of X is 28.7amu
Isotopes are atoms with the same number of protons but differing numbers of neutrons.
Different isotopes have various atomic masses.
The proportion of atoms with a particular atomic mass that can be found in a naturally occurring sample of an element is known as the relative abundance of an isotope.
An element's average atomic mass is computed as a weighted average by multiplying the relative abundances of its isotopes by their respective atomic masses, then adding the resulting products.
Using mass spectrometry, it is possible to determine the relative abundance of each isotope.
The atomic weight of the element will be a weighted average of the isotopes based on the relative abundance:
(27.730 x 0.6058) + (28.841 x 0.1835) + (31.321 x 0.2107) = 16.7988 + 5.2923+ 6.599 = 28.690 = 28.7 amu.
Average atomic weight of X is 28.7amu
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L 8.1.4 Quiz: Types of Chemical Reactions
Question 1 of 10
Which products are formed when ethane (C₂H6) undergoes combustion?
OA. H₂O, CO₂, and 02
OB. H₂ and CO₂
OC. H₂0 and CO₂
OD. H₂O and C
SUBMIT
Answer:
C.) H₂O and CO₂
Explanation:
A product is what is created during reaction (the things on the right side of the chemical equation). A combustion reaction always forms water, carbon dioxide, and heat. In this case, the equation looks like this:
2 C₂H₆ +7 O₂ ----> 6 H₂O + 4 CO₂
A crystallographer measures the horizontal spacing between molecules in a crystal. The spacing is 16.84 nm. What is the total width of a crystal in
millimeters 105 molecules across? Write your answer as a decimal.
Answer:
u can just multiply 1
Explanation:
krkrfmfmmfdkd
What advantage do mineral base lubricants have over vegetable oil base lubricants when used in aircraft engines
Advantages of mineral-based lubricants:
Chemical stability is the advantage of mineral-based lubricants over vegetable oil-based lubricants when used in aircraft engines.
Lubricants used in aircraft engines:
Mineral oils are used in modern aircraft engines because they can maintain a specified viscosity over a wide range of temperatures. For instance, the capacity to function in temperatures between -10°C and 40°C is crucial for the start-up of an aircraft engine. Greater grade oils can be utilized at higher ambient and startup temperatures, but they are useless in arctic or freezing circumstances, where a synthetic multigrade would be more appropriate.
Because mineral oils are more fluid even at low temperatures, they can reach every part of an aircraft's engine far faster than vegetable oils can. As a result, the engine will start up with less wear.
Additionally, compared to vegetable oils, mineral oils can result in significant fuel savings of between 1.5 percent and 3 percent. The usage of mineral oils makes sense for operators attempting to stay competitive in the airline industry since it results in lower fuel costs as well as reduced expenses for maintenance and engine downtime due to excessive wear and extended active service life.
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Using the following equation
2C2H6 +7O2 -->4CO2 +6H2O
if 19 g C2H6 react with 115 g O2, what is the limiting reactant?
The balanced equation says that 2 moles C₂H₆ and 7 moles O₂ react together, i.e. in a ratio of 7:2 or 3.5 moles of O₂ to C₂H₆.
With molar masses 30.07 g/mol (C₂H₆) and 31.998 g/mol (O₂), the given quantities amount to
(19 g C₂H₆) × (1/30.07 mol/g) ≈ 0.63 mol C₂H₆
(115 g O₂) × (1/31.998 mol/g) ≈ 3.59 mol O₂
Now, 0.63/2 ≈ 0.32, and for every 0.32 mol C₂H₆ consumed, the reaction requires 7×0.32 ≈ 2.2 mol O₂. Then in order to consume all of the C₂H₆, the reaction would need 2×2.2 ≈ 4.4 mol O₂, which we don't have.
In other words, we have too much C₂H₆ and not enough O₂, so O₂ is the limiting reactant.
Complete the table below by writing the symbols for the cation and anion that make up each ionic compound.
The ions are as follows;
As2O3 - As^3+, O^2-MnS - Mn^2+, S^2-VCl3 - V^3+, Cl^-NiF2 - Ni^2+, F^-What is a cation and an anion?A cation is a positive ion while an anion is a negative ion. Ionic compounds are composed o cations and anions.
The anions and cations in the ionic compounds in the table are shown below;
As2O3 - As^3+, O^2-MnS - Mn^2+, S^2-VCl3 - V^3+, Cl^-NiF2 - Ni^2+, F^-Learn more about cations and anions:https://brainly.com/question/4933048
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Which of the following could be the subshell representation of an element of Group IV?
A. s 2
B. s 2p 3
C. s 2p 2
D. s 2p l
The subshell representation of an element of Group IV is option C. s² p², since it contains 4 valence electrons.
What are Groups?In the Periodic Table, the Groups are the columns. For the Main-group elements, the group number coincides with the number of electrons in the valence shell.
Which of the following could be the subshell representation of an element of Group IV?
A. s². No, since there are 2 valence electrons.
B. s² p³. No, since there are 5 valence electrons.
C. s² p². Yes, since there are 4 valence electrons.
D. s² p¹. No, since there are 3 valence electrons.
The subshell representation of an element of Group IV is option C. s² p², since it contains 4 valence electrons.
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The specific heat capacity of a pure substance can be found by dividing the heat needed to change the temperature of a sample of the substance by the mass of the sample and by the change in temperature. The heat capacity of a certain substance has been measured to be 2.76J·g°C. Suppose 466.g of the substance are heated until the temperature of the sample has changed by 39.4°C. Write an equation that will let you calculate the heat that was needed for this temperature change. Your equation should contain only symbols.
Answer:
See below
Explanation:
ΔQ = m c T ΔQ = heat required(J) m = mass (g) T = C° temp change
c = heat capacity in J/g-C
What is the nuclear binding energy per mole if the mass defect of a certain isotope is 0.1303 u per atom or 0.1303 g per mol
The nuclear binding energy per mole if the mass defect of a certain isotope is 0.1303 g per mol is [tex]3.909\times10^{7}\\[/tex]
What is the mass defect?
The difference between the total mass of a nucleus and the sum of the masses of all its constituent nucleons is known as the mass defect of the nucleus.
What is binding energy?The binding energy (BE) of a nucleus is equal to the amount of energy released in forming the nucleus. It is the mass defect multiplied by the speed of light squared.[tex]BE=\Delta mc^{2}[/tex]
Here,
The mass defect Δm is 0.1303g per mol
Therefore,
[tex]BE=\Delta mc^{2}\\BE=0.1303\times 3\times10^{8}\\BE=0.3909\times10^{8}\\BE=3.909\times10^{7}\\[/tex]
Hence, the nuclear binding energy per mole if the mass defect of a certain isotope is 0.1303 g per mol is [tex]3.909\times10^{7}\\[/tex]
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What is the theoretical yield of aluminum oxide if 3.00 mol of aluminum metal is exposed to 2.55 mol of oxygen? Express your answer with the appropriate units.
1.5 mol is the theoretical yield of aluminum oxide if 3.00 mol of aluminum metal is exposed to 2.55 mol of oxygen.
What is Balanced Chemical Equation ?The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.
2Al + [tex]\frac{3}{2}[/tex] O₂ → Al₂O₃
4Al + 3O₂ → 2 Al₂O₃ [Balanced Chemical Equation]
When aluminium is the limiting reagent then
3.00 × [tex]\frac{1}{2}[/tex] = 1.5 mol
When oxygen is the limiting reagent then
2.55 × [tex]\frac{2}{3}[/tex] = 1.70 mol
Thus from the above conclusion we can say that 1.5 mol is the theoretical yield of aluminum oxide if 3.00 mol of aluminum metal is exposed to 2.55 mol of oxygen.
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Self-driving cars are already cruising the streets today. And while these cars will ultimately be safer and cleaner than their manual counterparts, they can’t completely avoid accidents altogether.
In your initial post, you should address the moral and ethical dilemas of self-driving cars. Include a personal reflection in your post. You must respond to at least two classmates' post in a meaningful way to receive full credit.
You do not have to answer all of the questions below. These questions are here to aid you as you reflect on the topic.
1. Is there a clear cut morally or ethically correct answer to the situation described?
2. Who gets to decide how the car will be programmed and what decision the car will make? Is that fair?
3. What if the person programming the car has different ethical and moral beliefs than the general public?
4. What if the person programming the car is biased and/or looking to make money for the car company?
5. Are moral/ethics situational? Why or why not?
6. What is the difference between a ”reaction” (human driver’s split second response) and a “deliberate decision” (driverless car’s calculated response)?
7. Programing a car to react in a certain way in an emergency accident situation could be viewed as premeditated homicide. Do you think this is a valid argument? Why or why not?
8. In the situation described, would you prioritize your safety over everyone else’s by hitting the motorcycle?
9. In the situation described, would you minimize danger to others by not swerving? if so, you would hit the large object and potentially die.
10. In the situation described, would you take the middle ground by hitting the SUV since it’s less likely the driver will be injured? Compare this to hitting the motorcycle.
Self -driving cars are just like any other human invention. With respect to efficiency, every human invention has always been progressive. Hence, It is right to state that as far as ethical dilemmas are concerned, there is nothing wrong with self-driving cars.
What is an ethical dilemma?An ethical dilemma is a situation (more of a problem) where there is a conflict of tension between two opposition options each of which are not good ethically.
Why are Self-Driving Car not unethical?The above question is like asking, "why are C-19 vaccines not unethical?".
It is to be noted that most if not all inventions of man are amoral. Self-Driving cars are not intentionally created to destroy property or lives. As with most inventions, the damage is done in how they are used.
What if those programming the cars are economically biased in favor of the company?In the age of capitalism, there is yet to be any organization that is not biased economically in favor of itself.
The best that the government can do is to set up a team of industry experts that understand how the self-driving cars operate to audit, control, and check what cars are released for legal use on the streets.
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A student measures the molar solubility of silver carbonate in a water solution to be M. Based on her data, the solubility product constant for this compound is
A student measures the molar solubility of silver carbonate in a water solution to be 1.24 × 10⁻⁴ M. Based on her data, the solubility product constant for this compound is 7.63 × 10⁻¹² M³.
What is Stoichiometry ?Stoichiometry helps us use the balanced chemical equation to measure quantitative relationships and it is to calculate the amounts of products and reactants that are given in a reaction.
Silver carbonate dissociates as follows
Ag₂CO₃ (s) ⇄ 2Ag⁺ (aq) + CO₃⁻² (aq)
How to find the Solubility Product Constant ?To find the solubility product constant use the expression
[tex]K_{sp} = [A^{+}]^{a} [B^{-}]^{b}[/tex]
where
[tex]K_{sp}[/tex] = Solubility product constant
A⁺ = cation in an aqueous solution
B⁻ = anion in an aqueous solution
a, b = concentration of a and b
Molar Solubility (S) = 1.24 × 10⁻⁴ M
Solubility, Ag⁺ = 2S
Solubility, CO₃⁻² = S
Put the value in above expression, we get
[tex]K_{sp} = [A^{+}]^{a} [B^{-}]^{b}[/tex]
= [Ag⁺]² [CO₃⁻²]¹
= [2S]² [S]¹
= 4S² × S
= 4S³
= 4 × ( 1.24 × 10⁻⁴ M)³
= 7.63 × 10⁻¹² M³
Thus from the above conclusion we can say that A student measures the molar solubility of silver carbonate in a water solution to be 1.24 × 10⁻⁴ M. Based on her data, the solubility product constant for this compound is 7.63 × 10⁻¹² M³.
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Disclaimer: The question was given incomplete on the portal. Here is the complete question.
Question: A student measures the molar solubility of silver carbonate in a water solution to be 1.24 × 10⁻⁴ M. Based on her data, the solubility product constant for this compound is ..........
Advances in medical technology and healthcare have increased the life expectancy of people around the world. what negative effect has this also influenced?
The negative effect of technology on Healthcare:
Impersonal treatment, harmful health impacts, higher expenditures, the potential for overuse, and privacy violations are just a few of the negative effects of medical technology.
Medical technology:
It refers to all technological tools or apparatus utilized to protect human life. Medical equipment such as an insulin pump, a wireless brain sensor, a blood glucose meter, a digital thermometer, pulse oximeters, smart inhalers, etc the tools which had helped patients receive better medical treatment.
Effects of Medical technology:
Medical technology, nevertheless, can potentially cause issues for the patient like:
1. Impersonal treatment: When a healthcare professional uses technology too frequently, they could spend less time getting to know the patient as a person and more time dealing with the equipment.
2. Harmful health impacts: Surgery, radiation therapy, and chemotherapy are a few examples of treatments that might be advantageous but also have risks.
3. Higher expenditures: Due to the research and marketing required to bring new technologies to market and to generate a profit for their creators and manufacturers, they may result in increased patient costs.
4. Potential for overuse: The use of a technology or new product by a medical professional may be encouraged by the manufacturer, regardless of whether it is in the patient's best interest.
5. Privacy violation: Electronic medical records (EMR), for example, collect and manage patient information. This new technology is convenient, but it also has the potential to be misused, compromising patient privacy and personal data.
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What does the absorption spectrum of an atom show?
The absorption spectrum of an atom shows pattern of dark lines or bands attained by transmitting absorbed light beam into the spectroscope.
What does an atom's absorption spectrum look like?By sending an absorbed light beam into a spectroscope, one can create a pattern of black lines or bands.
The vapors or solution of a substance in the discharge tube are illuminated by a white light. After passing through a spectroscope, the transmitted light produces a spectrum of black lines at specific wavelengths. These shady lines match the light radiation wavelengths that the material has absorbed.
An atom, ion, or molecule absorbs photons with energies equal to the energy difference between the two states when it transitions from one to the other. An absorbance spectrum that depicts the intensity of emission as a function of wavelength is the end result.
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A solution containing 1.63 grams BaCl2 is added to a solution containing 2.40 grams of Na2CrO4
and reacts according the equation BaCl2 + Na2CrO4 → BaCrO4 + 2 NaCl
How many grams of BaCrO4 can be formed?
1.98 g many grams of [tex]BaCrO_4[/tex] can be formed if a solution containing 1.63 grams [tex]BaCl_2[/tex] is added to a solution containing 2.40 grams of [tex]Na_2CrO_4[/tex].
What are moles?A mole is defined as 6.02214076 × [tex]10^{23}[/tex]of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
[tex]BaCl_2 + Na_2CrO_4[/tex][tex]\rightarrow[/tex] [tex]BaCrO_4 + 2 NaCl[/tex]
Mass of [tex]BaCl_2[/tex] = 1.63 g
Molar mass of [tex]BaCl_2[/tex] = 208.23 g/mol
Moles of [tex]BaCl_2[/tex] = 1.63/ 208.23 = 0.0078 mol
Mass of [tex]Na_2CrO_4[/tex] = 2.40 g
Molar mass of [tex]Na_2CrO_4[/tex] = 161.97 g/mol
Moles of [tex]Na_2CrO_4[/tex]= [tex]\frac{mass}{molar \;mass}[/tex]
Moles of [tex]Na_2CrO_4[/tex] =[tex]\frac{2.40}{161.97 }[/tex]
=0.0148 mol
From the balanced equation mole ratio of [tex]BaCl_2[/tex] : [tex]Na_2CrO_4[/tex] = 1:1
But here, moles of [tex]BaCl_2[/tex] < moles of [tex]Na_2CrO_4[/tex]
Therefore, [tex]BaCl_2[/tex] is the limiting reagent.
From the balanced equation above it is clear that 1 mol of[tex]BaCl_2[/tex] reacts with 1 mol of [tex]Na_2CrO_4[/tex] to give1 mol of [tex]BaCrO_4[/tex].
Therefore, 0.0078 mol of [tex]BaCl_2[/tex] will produce 0.0078 mol of [tex]BaCrO_4[/tex].
Molar mass of [tex]BaCrO_4[/tex] = 253.37 g/mol
Therefore, the mass of [tex]BaCrO_4[/tex] can be formed = 0.0078 x 253.37 = 1.98 g
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Compare the ability to hold on to / attract electrons between metals and nonmetals.
(Use the concepts and trends about atomic radius and electronegativity.)
Nonmetals have the ability to attract electrons better than metals because they have a higher electron affinity or electronegativity than metals.
What is electronegativity?Electronegativity is the tendency, or a measure of the ability, of an atom or molecule to attract electrons and thus form bonds.
An element in the periodic table with a high electronegativity will automatically have a high electron affinity.
Metals (low electronegativity) are known to lose electrons to non-metals (high electronegativity), hence, nonmetals have the ability to attract electrons better than metals because they have a higher electron affinity or electronegativity than metals.
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How many grams are in 2.6 moles of ethanol (C2H5OH)?
Molar mass of ethanol
2(12)+5(1)+16+124+5+1729+1746g/molMass:-
No of moles×Molar mass2.6(46)119.6gAnswer:
Molar mass of ethanol (C2H5OH)
=2(12)+6(1)+16.1
=46.1 g/mol
How many grams I.e.,
mass = no. of moles × molar mass
= 2.6×46.1
= 119.86gWhy would an atom be more likely to form a chemical bond than existing as an independent particle?
Answer:
Covalent bonds form from shared electrons. Nature favors chemical bonding because most atoms have lower potential energy when they are bonded to other atoms than they have when they are independent particles.
The half-life of radium−226 is 1. 60 × 103 yr. How many hours will it take for a 2. 50−g sample to decay to the point where 0. 185 g of the isotope remains? enter your answer in scientific notation.
With the use of formula, It will take 5.2 x [tex]10^{7}[/tex] hours for a 2. 50g sample to decay to the point where 0. 185 g of the isotope remains.
What is the meaning of Half - Life ?The half life of a substance to decay is the time taken for half of the atoms initially present in the element to decay.
From the question, It is given that the half-life of radium−226 is 1. 60 × 103 yr. To know many hours it will take for a 2. 50 g sample to decay to the point where 0. 185 g of the isotope remains, we can use both logic and formula to solve this.
With the use of Formula,
N = [tex](1/2)^{t/T}N_{o}[/tex]
Where
N = quantity left behind after decay = 0.185 g[tex]N_{o}[/tex] = Initial quantity = 2.5 gt = Total time = 1600 yearsT = half - life timeSubstitute all the parameters into the formula
0.185 = [tex](1/2)^{t/1600}[/tex] x 2.5
0.185 / 2.5 = [tex](1/2)^{t/1600}[/tex]
0.074 = [tex](1/2)^{t/1600}[/tex]
Log both sides
Log(0.074) = Log[tex](1/2)^{t/1600}[/tex]
Log(0.074) = t/1600 Log(0.5)
t/1600 = Log(0.074) / Log(0.5)
t/1600 = -1.131 / -0.301
t/1600 = 3.7563
Cross multiply
t = 6010.13 years
Convert the year to hour
365 days = 1 year
24 hours = 1 day
24 x 365 = 8760 hours in one year
For 6010.13 years, there will be 6010.13 x 8760 = 52648738.8 hours
Which is 5.2 x [tex]10^{7}[/tex] hours.
Therefore, it will take 5.2 x [tex]10^{7}[/tex] hours for a 2. 50g sample to decay to the point where 0. 185 g of the isotope remains.
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What is the freezing point depression when sugar is dissolved in water to make a 0.50 molal solution?
The freezing point depression when sugar is dissolved in water to make a 0.50 molal solution is 0.93 °C.
What is the freezing point depression of water when sugar is added?The freezing point depression of a solvent is calculated using the formula below:
ΔT = -iKfmWhere:
i = Van’t Hoff factorKf = Freezing point constant of solvent (1.86°C/m for water)m = Molality of SolventThe Van’t Hoff factor for sugar = 1
m = 0.50
Substituting the values:
ΔTf = −1 ×1.86 × 0.50m = − 0.93°C
In conclusion, the freezing point of water is depressed by 0.93 °C.
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Using the periodic table, choose the more reactive non-metal.
S or As
Answer:
S
Explanation:
Reactivity goes UP as you go to the right or upward on the periodic table
S is above and to the right of As so we would expect it to be the more reactive of the two.
Calculate the volume of liquid in the tank sketched below. Give your answer in liters, and round to the nearest 0.1 L.
Answer:
1.3 L
Explanation:
The volume of a rectangular cube can be calculated using the following formula:
Volume (L) = length (cm) x width (cm) x height (cm)
Keep in mind that 1 L = 1,000 cm³.
Before you can plug the values into the equation, you need to make sure they all have the same unit. Since the length is in meters (m), you need to first convert it to centimeters.
1 meter = 100 cm
0.159 m 100 cm
--------------- x ---------------- = 15.9 cm
1 m
Now, you can solve for the volume. To find the answer is the unit liters, you need to divide the volume by 1,000.
Volume = l x w x h
Volume = 15.9 cm x 10.5 cm x 7.7 cm
Volume = 1,285.5 cm³
Volume = 1.2855 L ------> Volume = 1.3 L
A 0.65 M solution of an unknown amine base is found to be 2.2% ionized at equilibrium. Calculate the value for Kb for this amine.
The value of Kb of the unknown amine is 3.22 x 10^-4.
Weak electrolytes:
The compound which do not dissociate completely when added to the aqueous solution are called weak electrolytes. The electrolyte and its ions exists in equilibrium. In case of weak base, the equilibrium constant is expressed as Kb.
Calculations:
Step 1:
The percentage of amine ionized at equilibrium is 2.2%.
NH3 + H2O ------> NH4+ + OH-
The concentration of conjugate acid at equilibrium is calculated as:
2.2 = (x/0.65) x 100
x = 0.0143 M
Step 2:
The equilibrium constant (Kb) is calculated as:
Kb = x^2/0.65 - x
= (0.0143)^2/(0.65 - x)
= 3.22 x 10^-4
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If the volume of the original sample in Part A ( P1 = 242 torr , V1 = 27.0 L ) changes to 80.0 L , without a change in the temperature or moles of gas molecules, what is the new pressure, P2 ? Express your answer with the appropriate units.
The new pressure is 81.675 torr
Since temperature and moles are held constant, we use Boyle's Law:
A gas law known as Boyle's law asserts that a gas's pressure is inversely proportional to its volume when it is held at a fixed temperature and of a given mass.
To put it another way, as long as the temperature and volume of the gas remain constant, the pressure and volume of the gas are inversely proportional to one another.
The Anglo-Irish chemist Robert Boyle proposed Boyle's law in the year 1662.
P1V1=P2V2. Simply plug in your values. The units can remain in torr. Converting to atmospheres is not needed.
(242 torr)(27.0 L)=P2(80.0 L)
P2=[(242)(27)]/80 = 81.675 torr
Hence The new pressure is 81.675 torr
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I need this so badly!
I will give 50 points!
please no false answers/ spam links!!!!!
Determine the molar mass of a 0.314-gram sample of gas having a volume of 1.6 L at 287 K and 0.92 atm. Show your work
Describe the temperature and pressure conditions at which the gas behaves like an ideal gas.
Answer:
See below
Explanation:
Use Ideal Gas Law
PV = n RT using R = .082057366 l-atm/k-mol
T must be in Kelvin
solve for 'n'
.92 * 1.6 = n * .082057366 * 287
n = .0625 moles
then the mole weight: .0625 * x = .314
x = mole weight = 5.025 gm
"Systems with either very low pressures or high temperatures enable real gases to be estimated as “ideal.” "
The ideal gas equation estimates the molar mass of the substance with the help of the moles. The molar mass of 0.314 gm sample and 1.6 L volume is 0.503g/mol.
What is an ideal gas?The gas is said to be ideal at low pressure, and high-temperature conditions as the potential energy and the molecular size become negligible because of the intermolecular forces.
The ideal gas equation is given as,
PV = nRT
Given,
Pressure (P) = 0.92 atm
Volume (V) = 1.6 L
Gas law constant (R) = 0.0821
Temperature (T) = 287 K
Mass of sample = 0.314 gram
No. of moles = n
The moles are calculated as:
PV = nRT
0.92 × 1.6 = n × 0.0821 × 287
1.47 = 23.56 × n
n = 1.47 ÷ 23.56
n = 0.624 moles
Now, from moles, the molar mass is calculated as,
Molar mass = mass ÷ moles
Molar mass = 0.314g ÷ 0.624mol
Molar mass = 0.503 g/mol
Therefore, 0.503g/mol is the molar mass of the 0.314 gm sample.
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