Taking into account the definition of dilution, the final concentration of the solution is 0.68 M.
Definition of dilutionDilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, and the volume of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Ci: initial concentrationVi: initial volumeCf: final concentrationVf: final volumeFinal concentrationIn this case, you know:
Ci: 4.2 MVi: 14 mLCf: ?Vf: 86 mLReplacing in the definition of dilution:
4.2 M× 14 mL= Cf× 86 mL
Solving:
(4.2 M× 14 mL)÷ 86 mL= Cf
0.68 M= Cf
In summary, the final concentration is 0.68 M.
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Determine which statements are consistent with Daltons atomic theory
Answer:
Explanation:
Dalton's atomic theory had several postulates, including:
1. All matter is made up of atoms, which are indivisible and indestructible.
2. All atoms of a given element are identical in mass and properties.
3. Compounds are formed by a combination of two or more different kinds of atoms.
4. A chemical reaction is a rearrangement of atoms.
Based on these postulates, the following statements are consistent with Dalton's atomic theory:
1. Chemical reactions involve the rearrangement of atoms to form new compounds.
2. Elements are composed of small, indivisible particles called atoms.
3. Atoms of the same element have the same mass and chemical properties.
4. A compound is made up of two or more different elements.
5. Atoms can neither be created nor destroyed in a chemical reaction.
However, the following statements are not consistent with Dalton's atomic theory:
1. Atoms are divisible into smaller particles.
2. Isotopes of the same element have different chemical properties.
3. The mass of an atom is distributed uniformly throughout the atom.
It's worth noting that while Dalton's atomic theory has been largely superseded by modern atomic theory, it remains an important historical milestone in the development of atomic theory.
Under what conditions would one mole of methane gas, ch4 , occupy the smallest volume?
Under the condition A. 273 K and 1.01 × [tex]10^{5}[/tex] Pa, one mole of methane gas, [tex]CH_{4}[/tex], occupy the smallest volume.
What is the smallest volume ?
The ideal gas law, PV = nRT, can be rearranged to solve for volume as V = nRT/P, where V is volume, n is the number of moles, R is the gas constant, T is temperature in Kelvin, and P is pressure.
To find the conditions under which one mole of methane gas occupies the smallest volume, we need to find the combination of temperature and pressure that results in the smallest volume.
Using the equation V = nRT/P, we can see that volume is inversely proportional to pressure, so we want the highest pressure possible. Therefore, we can eliminate choices A and C, which have lower pressures than B and D.
Next, we need to consider temperature. Using the same equation, we can see that volume is directly proportional to temperature, so we want the lowest temperature possible. Therefore, the correct choice is A, which has a temperature of 273 K, the lowest temperature of all the choices.
Therefore, the answer is A. 273 K and 1.01 × [tex]10^{5}[/tex] Pa.
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Complete question is: Under the 273 K and 1.01 × [tex]10^{5}[/tex] Pa condition, one mole of methane gas, [tex]CH_{4}[/tex], occupy the smallest volume.
How many carbon atoms are in 11.5 g C2H5OH?
There are approximately 3.02 x 10²³ carbon atoms in 11.5 g of [tex]C_{2}H_{5} OH[/tex]
To calculate the number of carbon atoms present in the 11.5g of [tex]C_{2}H_{5}OH[/tex]which is ethanol, we need to find and calculate the number of moles of ethanol present and convert moles to the number of carbon atoms by using Avogadro's number.
The molecular weight of [tex]C_{2}H_{5}OH[/tex] is =
no. of atoms x its atomic weight. So the molecular weight is,
(2 atoms of carbon x 12 g/mol )+ (5 atoms of hydrogen x 1 g/mol) + (1 atom of oxygen x 16 g/mol) + (1 atom of hydrogen x 1 g/mol ) =
24+10+16+1 ≅ 47 g/mol
The number of moles of ethanol = given mass / molecular weight = 11.5g /47 g/mol = 0.2446 moles
Number of Carbon atoms = no. of moles of ethanol x Avogadro number x no. of carbon atoms in each molecule of ethanol = 0.2446 moles x 6.022 x 10²³ atoms/mol x 2 carbon atoms/molecule ≅ 3.02 x 10²³
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What is the temperature of 0.59 mol of gas at a pressure of 1.0 atm and a volume of 11.0 L? (Express the temperature in kelvins to two significant figures).
Answer:
T = 230 K
Explanation:
Simply use the equation: PV = nRT, where P is pressure, V is volume, n is moles, R is 0.0821, and T is temperature in kelvin
Place the values in
(1.0 atm)(11.0 L)=(0.59 moles)(0.0821 Lxatm/Kxmol)(T)
Solve for T = 230 K
Show that the following reaction obeys zero order kinetics, and find the rate constant and half-life. 10²x[A]/mol dm-3 13.80 11.05 8.43 5.69 3.00 Time/hr 0 10 20 30 40
The half life for the given reaction is 20s. The rate constant for the given zero order reaction can be given as 0.5mol L⁻¹s⁻¹.
According to the definition of a zero-order reaction, it is "a chemical reaction that occurs when the rate of response remains unchanged whether the percentage of the reactants increases or decreases." Since the rate increases according in proportion to the 0th magnitude of the reactant concentration, the rate at which these responses is always equivalent to the constant rate for the particular reactions.
k = 0.5mol L⁻¹s⁻¹
Half life is a/2K=3/2×40
= 20s
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Sucrose (C12H22011) is combusted in air according to the following reaction:
C12H22011(s) + O2(g) = CO2(g) + H2O(l )
How many moles of carbon dioxide would be produced by the complete combustion of 38.5 grams of sucrose in the presence of excess oxygen?
Okay, let's break this down step-by-step:
1) The molecular formula for sucrose is C12H22011. This means each mole of sucrose contains 12 moles of carbon and 22 moles of hydrogen.
2) You are combusting 38.5 grams of sucrose. To convert grams to moles, we divide by the molar mass:
Molar mass of C12H22011 = 342.3 g/mol
So 38.5 g / 342.3 g/mol = 0.113 moles of sucrose
3) According to the combustion reaction, each mole of sucrose produces 12 moles of CO2.
So 0.113 moles of sucrose will produce 0.113 * 12 = 1.356 moles of CO2.
4) Round to the nearest whole number:
1 mole of CO2
Therefore, the complete combustion of 38.5 grams of sucrose in excess oxygen would produce 1 mole of carbon dioxide.
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A 346.9 mL sample of carbon dioxide was heated to 373 K. If the volume of the carbon dioxide sample at 373 K is 596.2 mL,
what was its temperature at 346.9 mL?
T =
Answer:
216.9 K
Explanation:
We can use the combined gas law to solve this problem:
(P1V1/T1) = (P2V2/T2)
where P is pressure, V is volume, and T is temperature. We can assume that the pressure is constant, since the problem doesn't mention any changes in pressure.
Let's label the initial temperature T1 and the final temperature T2, and plug in the given values:
(P1V1/T1) = (P2V2/T2)
V1 = 346.9 mL
V2 = 596.2 mL
T2 = 373 K
(P1 * 346.9 mL / T1) = (P1 * 596.2 mL / 373 K)
Simplifying and solving for T1:
T1 = (P1 * 346.9 mL * 373 K) / (P1 * 596.2 mL)
T1 = (346.9 * 373) / 596.2
T1 = 216.9 K
Therefore, the temperature of the carbon dioxide sample at 346.9 mL was 216.9 K.
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Select the correct answer. A certain reaction has this form:aA bB. At a particular temperature and [A]0 = 2.00 x 10-2 Molar, concentration versus time data were collected for this reaction and a plot of ln[A]t versus time resulted in a straight line with a slope value of -2.97 x 10-2 min-1. What is the reaction order and rate law for this reaction? A. first, rate = k[A] B. first, rate = k[A]2 C. second, rate = k[A] D. second, rate = k[A]2 E. third, rate = k[A]
The reaction order and rate law for this reaction is first, rate = k[A]. Option A is correct.
The reaction order and rate law for a reaction can be determined from the slope of a plot of ln[A] versus time.
Given that the plot of ln[A] versus time resulted in a straight line with a slope value of -2.97 x 10⁻² min⁻¹, we can determine the reaction order and rate law as follows;
If the slope is equal to 1, the reaction order is 1st order.
If the slope is equal to 2, the reaction order is 2nd order.
If the slope is equal to 3, the reaction order is 3rd order.
From the given slope of -2.97 x 10⁻² min⁻¹, we can conclude that the reaction order is 1st order, because the slope value is equal to -1 times the reaction order. So, the reaction order for this reaction is 1st order.
The rate law for a 1st order reaction will be given by;
rate = k[A]
where [A] is the concentration of the reactant, and k is the rate constant.
Therefore, first, rate = k[A].
Hence, A. is the correct option.
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A researcher is studying gold complexes. She makes
a 125 mL solution of gold(III) chloride by dissolving
0.144 moles of the solute into water. Which of the
following would cause the concentration of the
solution to increase?
Additional gold(III) chloride is added to the
beaker.
Part of the solution is poured into the chemical
waste.
O Water is added to the beaker.
We do not have enough information to answer
this question.
Additional gold(III) chloride is added to the beaker. This would cause the concentration of the solution to increase. Therefore, the correct option is option A.
Concentration in chemistry refers to the quantity of a material in a certain area. The ratio of the solute within a solution to the solvent or whole solution is another way to define concentration. In order to express concentration, mass / unit volume is typically used.
The solute concentration can, however, alternatively be stated in moles or volumetric units. Concentration may be expressed as per unit mass rather than volume. Although concentration is typically used to describe chemical solutions, it may be computed for any mixture. Additional gold(III) chloride is added to the beaker. This would cause the concentration of the solution to increase.
Therefore, the correct option is option A.
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Macmillan Learning
A 346.9 mL sample of carbon dioxide was heated to 373 K. If the volume of the carbon dioxide sample at 373 K is 596.2 mL,
what was its temperature at 346.9 mL?
T=. K
Answer:
Explanation:
Use the Equation: [tex]\frac{V1}{T1}=\frac{V2}{T1} \\[/tex]
V1 = 346.9 mL
T1 = ? K
V2 = 596.2 mL
T2 = 373 L
This assumption can only be made when pressure is held constant.
[tex]\frac{346.9}{V1}=\frac{596.2}{373}, solve for V1\\ V1 = 217.0 K[/tex]
A sample of helium gas, He(g), is placed in a rigid cylinder sealed with a movable piston.
The temperature of the helium is 25.0°C. The volume of the helium is 300. milliliters and
the pressure is 0.500 atmosphere.
16) State, in terms of the average distance between the helium atoms, why the density of the gas increases when the piston is pushed farther into the rigid cylinder. [1]
17) Determine the volume of the helium gas when the pressure is increased to 1.50 atm and
the temperature remains at 25.0°C. [1]
(16) When the piston is pushed farther into the rigid cylinder, the volume available for the helium gas decreases. This leads to an increase in density because the gas molecules are packed into a smaller volume, resulting in a shorter average distance between the helium atoms; (17) volume = 100mL.
What will be the effect on density on pushing the piston farther into the rigid cylinder?When the piston is pushed farther into the rigid cylinder, the volume available for the helium gas decreases. This causes the average distance between the helium atoms to decrease as well. Since the volume available for the gas molecules to move in is reduced, they will collide more frequently with each other and with the walls of the container, leading to an increase in density.
(17) To determine the new volume of the helium gas, we can use the combined gas law:
(P1V1)/T1 = (P2V2)/T2
where P1, V1, and T1 are the initial pressure, volume, and temperature of the helium gas, and P2 and T2 are the final pressure and temperature.
Substituting the given values, we get:
(0.500 atm)(300. mL)/(298.15 K) = (1.50 atm)(V2)/(298.15 K)
Solving for V2, we get:
V2 = (0.500 atm)(300. mL)/(1.50 atm) = 100. mL
Therefore, the volume of the helium gas when the pressure is increased to 1.50 atm and the temperature remains at 25.0°C is 100mL.
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Which of the diagrams show a beaker in which electrolysis takes place?
The beakers that we can see that electrolysis is going on are in beakers B and C
What is electrolysis?Electrolysis is a process in which an electric current is passed through a substance to produce a chemical reaction. The substance being electrolyzed is usually an electrolyte, which is a liquid or solution that contains ions.
The electric current causes the ions in the electrolyte to move towards the electrodes (conducting surfaces) where they either gain or lose electrons, depending on the nature of the electrode and the ions. This causes chemical reactions to occur at the electrodes, leading to the formation of new substances.
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please help this is dus today please help
A percentage expressing the variation between a calculated/measured value and the anticipated/real value is known as a "calculated percent error."
What does this mean?A positive numerical discrepancy implies that the assessed number exceeds what was expected, with negative values indicating the reverse.
When conducting an experiment, if an excessive percent error emerges it suggests potential errors or miscalculations in experimental design, data collection, or analysis.
This may mean unaccounted variables were present, and equipment/procedures require refinement. In opposition, lower percentages signal accuracy despite any limitations resulting from the human elements involved.
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A compound has a similar molecular mass of 180grams/mol. It contains 40.8% carbon,5.8% hydrogen and 53.4% oxygen. Calculate its empirical formula and molecular formula, and give its common name.
Answer:
To find the empirical formula of the compound, we need to determine the simplest whole-number ratio of atoms in the molecule.
First, we can assume that we have 100 grams of the compound, and calculate the number of moles of each element present in it:
Carbon: 40.8 g / 12.011 g/mol = 3.398 mol
Hydrogen: 5.8 g / 1.008 g/mol = 5.753 mol
Oxygen: 53.4 g / 15.999 g/mol = 3.337 mol
Next, we divide each of these values by the smallest one, which is 3.337, to get the mole ratio:
Carbon: 3.398 mol / 3.337 mol = 1.019
Hydrogen: 5.753 mol / 3.337 mol = 1.723
Oxygen: 3.337 mol / 3.337 mol = 1.000
Rounding these values to the nearest whole number, we get the empirical formula: C1.0H1.7O1.0, which can be simplified to CH1.7O.
To find the molecular formula, we need to know the actual molecular mass of the compound. We can estimate it by adding the atomic masses of the elements in the empirical formula:
Carbon: 1 x 12.011 = 12.011
Hydrogen: 1.7 x 1.008 = 1.714
Oxygen: 1 x 15.999 = 15.999
Total = 29.724 g/mol (approx.)
The molecular mass is close to 180 g/mol, which suggests that the actual molecular formula is a multiple of the empirical formula. Dividing 180 by 29.724, we get a value of about 6.05. Multiplying the subscripts in the empirical formula by this value, we get the molecular formula: C6H10.2O6, which can be further simplified to C3H5.1O3.
The compound with the empirical formula CH1.7O and the molecular formula C3H5.1O3 is commonly known as glyoxylic acid.
3. A solution of hydrochloric acid is made by dissolving hydrogen chloride gas in 100.0ml water. This solution neutralizes a 15ml sample of 0.10 mol/L sodium carbonate solution. a. What mass of hydrogen chloride gas was dissolved in 100.0ml of water? b. What volume of hydrogen chloride was this?
Okay, here are the steps to solve this problem:
a) To neutralize 15ml of 0.10 mol/L sodium carbonate solution, the hydrochloric acid solution must contain 0.015 moles of HCl.
Since the HCl solution is made by dissolving HCl gas in 100ml water, we can calculate the moles of HCl gas dissolved in 100ml:
0.015 moles HCl / 15ml sodium carbonate solution = X moles HCl gas / 100ml HCl solution
X = 0.015 * (100/15) = 0.01 moles HCl gas
b) Molar volume of HCl gas at STP is 24.45 L/mol.
So the volume of 0.01 moles HCl gas is: 0.01 moles * 24.45 L/mol = 0.2445 L
Since the solution is made with this gas in 100ml water, the volume of HCl gas dissolved in 100ml water is 0.2445 L.
So the final answers are:
a) 0.01 moles of HCl gas
b) 0.2445 L of HCl gas
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For which of the following reactions does ΔH
o
rxn
= ΔH
o
f
?
(a) H2(g) + S(rhombic) → H2S(g)
(b) C(diamond) + O2(g) → CO2(g)
(c) H2(g) + CuO(s) → H2O(l) + Cu(s)
(d) O(g) + O2(g) → O3(g)
ΔH° = ΔHf° is true for two reactions which are ,
H₂(g) + S(rhombic) → H₂S(g)
C(diamond) + O₂(g) → CO₂(g)
Hence, option a and b are correct.
∆Hf is the enthalpy of formation, is the enthalpy when product is made from its constituent elements. Generally the enthalpy of formation is described as the standard reaction enthalpy for the formation of the compound from its elements (which may include atoms or molecules) in their most stable reference states at the chosen temperature (298.15K) and at 1bar pressure.
In a part, H₂S is formed by H₂ and S means it's constituent elements.
So, a is correct.
In b also, CO₂ is formed by C and O₂, so b is also correct. Hence, option a and b are correct.
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How many chloride ions are in 15.0 mL of a 2.5 molar solution of magnesium chloride? (MgCl2)
In 15.0 mL of a 2.5 molar magnesium chloride solution, there are approximately 4.51 × 10^{22} chloride ions.
How many chloride ions are there in MgCl_2?An inorganic compound composed of one magnesium ion and two chloride ions.
We must first determine the number of moles of MgCl_2 in the solution,
moles of solute = concentration × volume (in liters)
Converting the solution's volume from milliliters to liters,
15.0 mL = 15.0 × 10^{-3} L
moles of MgCl_2 = 2.5 mol/L × 15.0 × 10^{-3} L = 0.0375 moles
The solution contains the following number of chloride ions:
number of Cl^{-} ions = 2 × moles of MgCl_2
Substitute the value of moles of MgCl_2,
number of Cl^{-} ions = 2 × 0.0375 moles = 0.075 moles
by using Avogadro's number:
number of Cl^{-} ions = 0.075 moles × 6.02 × 10^{23} ions/mol ≈ 4.51 × 10^{22} ions
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What is the energy change for the following equation?
Answer:
1) -572 kJ/mol
2) -2220.7 kJ/mol
Explanation:
Multiply the bond enthalpies to take into account the amount of moles of each compound in the reaction. Then, to get the total change in energy/enthalpy in the reaction, subtract the reactant energy from the product energy.
1) 2(-286) = -572 kJ/mol
2) 4(-286) + -393.5(3) - -103.8 = -2220.7 kJ/mol
Give the number of significant figures indicated.
0.066
Which of the following reactants lead to the fastest reaction?
A) Solid aluminum and oxygen
B) Sodium hydroxide and hydrogen chloride in water
C) Copper nitrate and ethanol in water
D) Solid barium chloride and sodium sulfate
Solid aluminum and oxygen are the reactant that lead to the fastest reaction. Therefore, the correct option is option A.
Chemical reaction, the transformation of one or more chemicals (the reactants) into one or more distinct compounds (the products). Chemical elements or chemical compounds make up substances.
Chemical reactions constitute a fundamental component of life itself, as well as technology and culture. Burning fuels, melting iron, creating glass or pottery, brewing beer, making wine. Solid aluminum and oxygen are the reactant that lead to the fastest reaction.
Therefore, the correct option is option A.
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What is molecular weight of a substance given that 1.22g of the sample was vaporised in 100ml flask at 45°C and 687mmHg.
Classify each of the following aqueous solutions as a nonelectrolyte, weak electrolyte, or strong electrolyte.
(a) PbCl2
(b) N(CH3)3
(c) CsOH
(d) H2S
(e) CrCl2
(f) Ni(CH3COO)2
Strong electrolyte: lead(II) chloride weak electrolyte trimethylamine Strong electrolyte: cesium hydroxide sulphide of hydrogen: a weak electrolyte, strong electrolyte chromium chloride Weak electrolyte: nickel(II) acetate
Is acetic acid an electrolyte that is weak?Response and justification The fact that acetic acid has a low dissociation constant suggests that it is a weak acid. Acetic acid's restricted ability to ionise in an aqueous solution is a result of its low dissociation constant. With this in mind, acetic acid can be regarded as a weak electrolyte.
Is acid phosphoric a type of electrolyte?Phosphoric acid is a useful electrolyte because of its low volatility, strong ionic conductivity, stability at high temperatures, carbon dioxide and carbon monoxide tolerance, and low flammability.
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pls. help for chemistry hw. ASAP
6 moles will have 12 equivalents of PO₄²⁻
The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.
A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.
1 mole of Mg₃(PO₄)₂ has 2 equivalents of PO₄²⁻.
Thus, 6 moles will have 2 × 6 = 12 equivalents of PO₄²⁻
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Watch the animation and select the interactions that can be explained by hydrogen bonding.
HF
is a weak acid neutralized by NaOH
.
HF
has a higher boiling point than HCl
.
CH4
molecules interact more closely in the liquid than in the gas phase.
Ice, H2O
, has a solid structure with alternating H−O
interactions.
H2Te
has a higher boiling point than H2S
The interactions that can be explained by hydrogen bonding are:
HF has a higher boiling point than HClIce, H₂O, has a solid structure with alternating H−O interactions.Hydrogen bonding is a type of intermolecular force that occurs between a hydrogen atom in a polar molecule and a highly electronegative atom, such as nitrogen, oxygen, or fluorine, in a neighboring molecule. It is a relatively strong force and can significantly affect the physical and chemical properties of substances.
In the case of HF and HCl, both molecules are polar, but HF has a higher boiling point due to the stronger hydrogen bonding between its molecules. In ice, the hydrogen bonding between water molecules creates a crystal structure with a characteristic lattice arrangement.
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Calculation: 3. A new alloy of steel is 525 g at 100-C. It is dropped into 375 grams of water at 25 C. The final temperature changes to 55C, what is the specific heat of steel?
The specific heat capacity of the steel is 2 g/°C.
What is the specific heat capacity of the steel?To determine the specific heat capacity of a particular sample of steel, the sample can be heated to a known temperature and then placed in contact with a known amount of water at a lower temperature.
We know that the heat lost by the steel is equal to the heat gained by the water.
Thus we have that;
-(525 * c * (55- 100)) = (375 * 4.2 * (55- 25)
23625c = 47250
c = 47250/23625
c = 2 g/°C
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Calculate the mass of water produced when 1.03 g
of butane reacts with excess oxygen.
1.03 g of butane will yield 1.59 g of water when it reacts with too much oxygen.
What is mass?The amount of matter in an item is measured by the fundamental physical quantity known as mass. It is a scalar quantity that is measured in grams (g) or kilograms (kg) (g). No matter where it is or what force is pushing against it, an object's mass always remains constant.
How do you determine it?For butane and oxygen to burn, the chemical equation is balanced as follows:
2C4H10+13 O2→ 8 CO2+ 10 H2O
According to the equation, 1 mole of butane (C4H10) and 13/2 moles of oxygen (O2) combine to form 5 moles of water (H2O).
To begin with, we must count the butane moles that are present:
Mass of butane divided by its molar mass yields moles of butane.
1.03 g/58.12 g/mol is the formula for butane.
A mole of butane weighs 0.0177 mol.
Then, we can calculate the quantity of water created using the butane-to-water mole ratio:
Moles of water = [tex]\frac{5 mol H2O}{(1 mol C4H10 ×0.0177 mol C4H10)}[/tex] = 0.0885 mol.
Eventually, we can determine how much water was generated:
moles of water equal 0.0885 mol when 5 mol H2O is divided by 1 mol C4H10 and multiplied by 0.0177 mol C4H10.
Lastly, we can determine the mass of created water:
Water's mass is equal to its moles times its molar mass= 0.0885 mol × 18.02 g/mol = 1.59 g.
As a result, 1.03 g of butane will yield 1.59 g of water when it reacts with to moles of water equal 0.0885 mol when 5 mol H2O is divided by 1 mol C4H10 and multiplied by 0.0177 mol C4H10.
Lastly, we can determine the mass of created water:
Water's mass is equal to its moles times its molar mass = 0.0885 mol × 18.02 g/mol = 1.59 g.
As a result, 1.03 g of butane will yield 1.59 g of water when it reacts with too much oxygen.
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Consider a sample containing 0.300 mol of a substance. How many atoms are in the sample if the substance is iron?
The number of atoms in a sample containing 0.300 mol of iron is 1.8066 x 10²³ atoms.
The number of atoms in a sample of a substance can be determined using Avogadro's number, which is equal to 6.022 x 10²³ particles per mole. The atomic mass of iron is 55.85 g/mol.
Therefore, 0.300 mol of iron will contain:
0.300 mol x 6.022 x 10³ atoms/mol = 1.8066 x 10²³ atoms
Avogadro's number is a fundamental constant in chemistry that represents the number of particles (atoms or molecules) in one mole of a substance.
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Compare and contrast the four different types of solar activity above the photosphere. (Select all that apply)
A. Prominences are huge loops of the Sun’s ionized but cool material that are pushed by magnetic forces from the chromosphere into the corona.
B. There are regions of higher density and temperature than the surrounding material in the chromosphere called plages.
C. Flares are long lived phenomena above the photosphere beginning at the solar minimum and ending at solar maximum.
D. Coronal mass ejections happen when a flare is so violent that the material exceeds the escape speed of the sun. It is connected to sunspots.
There are up to four different kinds of features that can be seen when viewing the photosphere. Sunspots, faculae, granulation, and super-granulation are listed in decreasing order of observational ease. All the given statement are true.
Solar activityIn the chromosphere, plateaus are areas that are more dense and hotter than the surrounding material. Large, chilly, ionized loops of material known as prominences are slowly pushed into the corona by magnetic energy from the chromosphere. Flares are erratic, fiery, and intensely energetic bursts that last only a moment or two. When a flare is extremely powerful, its material is thrown into the solar system beyond the Sun's escape velocity and causes coronal mass ejections. These are all essentially connected to sunspots.For more information on solar activity above photosphere kindly visit to
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Calculate the molality of a solution prepared by dissolving 19.9 g of KCl in 750.0 mL of water.
Answer:
Explanation:
First, we need to calculate the moles of KCl:
Calculate the molar mass of KCl:
KCl = 39.10 g/mol (atomic weight of K) + 35.45 g/mol (atomic weight of Cl)
= 74.55 g/mol
Calculate the moles of KCl:
moles of KCl = mass of KCl / molar mass of KCl
= 19.9 g / 74.55 g/mol
= 0.267 mol
Next, we need to convert the mass of the solvent (water) from milliliters to kilograms:
Convert mL to L:
750.0 mL = 750.0 mL * (1 L / 1000 mL)
= 0.7500 L
Calculate the mass of water:
mass of water = volume of water x density of water
= 0.7500 L x 1000 g/L
= 750.0 g
Convert the mass of water to kilograms:
mass of water = 750.0 g / 1000 g/kg
= 0.7500 kg
Now we can calculate the molality of the solution:
molality = moles of solute / mass of solvent (in kg)
molality = 0.267 mol / 0.7500 kg
= 0.356 mol/kg
Therefore, the molality of the solution is 0.356 mol/kg.
when 56.6 g of calcium and 30.5g of nitrogen gas under go a reaction that has 90% yield, what mass of calcium nitride is formed?
Answer:
152.57 g
Explanation:
The balanced chemical equation for the reaction between calcium and nitrogen gas to form calcium nitride is:
3Ca + N2 → Ca3N2
From the balanced equation, we can see that the mole ratio between calcium and calcium nitride is 3:1. This means that 3 moles of calcium react to form 1 mole of calcium nitride.
First, let's calculate the number of moles of calcium and nitrogen gas given:
Mass of calcium = 56.6 g
Molar mass of calcium (Ca) = 40.08 g/mol
Moles of calcium = Mass of calcium / Molar mass of calcium = 56.6 g / 40.08 g/mol = 1.41 mol
Mass of nitrogen gas = 30.5 g
Molar mass of nitrogen gas (N2) = 28.02 g/mol
Moles of nitrogen gas = Mass of nitrogen gas / Molar mass of nitrogen gas = 30.5 g / 28.02 g/mol = 1.09 mol
Since the reaction has a 90% yield, only 90% of the limiting reactant (which is calcium in this case) will be converted to product. Therefore, we need to multiply the moles of calcium by 0.90 to account for the yield:
Moles of calcium nitride formed = Moles of calcium x Yield = 1.41 mol x 0.90 = 1.27 mol
Now, using the mole ratio from the balanced equation, we can determine the mass of calcium nitride formed:
Molar mass of calcium nitride (Ca3N2) = 40.08 g/mol (molar mass of calcium) x 3 + 14.01 g/mol (molar mass of nitrogen) x 2 = 120.25 g/mol
Mass of calcium nitride formed = Moles of calcium nitride formed x Molar mass of calcium nitride = 1.27 mol x 120.25 g/mol = 152.57 g
So, the mass of calcium nitride formed in the reaction is 152.57 g.