Question 1

A 1.50 mol sample of He occupies a volume of 2.50 L at a pressure of 14.7 atm.What will be the pressure of a 1.50 mol sample of H2 gas under the same conditions?

Accepted Answer

A)  7.33 atm
B)  14.7 atm
C)  29.4 atm
D)  1.00 atm
E)  24.5 atm

Question 2

What is the average kinetic energy (in kJ/mol) of nitrous oxide (N2O) molecules at 30.0 ∘\circ∘ C?

Accepted Answer

A)  0.906 kJ/mol
B)  3.78 kJ/mol
C)  288 kJ/mol
D)  147 kJ/mol
E)  2.52 kJ/mol

Question 3

On a given day,the atmospheric pressure is reported to be 30.8 in.of mercury.Using 1 atm as normal atmospheric pressure,this day would be classified as __________

Accepted Answer

A)  hot.
B)  dense.
C)  low pressure.
D)  high pressure.
E)  normal.

Question 4

The van der Waals constants for methane are a = 2.25 L2 .atm/mol2 and b = 0.0428 L/mol.What is the apparent temperature of 1.0000 mol CH4 in a 10.000 L container when it is treated as real relative to the same amount of gas in an identical container at -120.00 ∘\circ∘ C?

Accepted Answer

A)  "-176.8 ∘\circ∘ C"
B)  "-93.36 ∘\circ∘ C"
C)  "-153.2 ∘\circ∘ C"
D)  "-117.9 ∘\circ∘ C"
E)  "-155.2 ∘\circ∘ C"

Question 5

At the top of Mt.Everest,which has a height of 29,029 ft,atmospheric pressure is about 265 torr.Which of the following is NOT equivalent to 265 torr?

Accepted Answer

A)  10.4 in.Hg
B)  35.3 kPa
C)  5.12 lb/in2
D)  0.344 bar
E)  0.349 atm

Question 6

What is the root-mean-square speed of a carbon monoxide molecule in a sample of gas with an average kinetic energy of 3.41 kJ/mol?

Accepted Answer

The answer of What is the root-mean-square speed of a...

Question 7

Indicate the gas with the greatest density at STP.

Accepted Answer

A)  CH4
B)  He
C)  Ar
D)  H2
E)  O2

Question 8

A sample of gas at -15.0 ∘\circ∘ C is heated in a constant volume container until the pressure is 65.0% higher than its original value.What is the final temperature of the gas?

Accepted Answer

A)  153 ∘\circ∘ C
B)  426 ∘\circ∘ C
C)  202 ∘\circ∘ C
D)  124 ∘\circ∘ C
E)  298 ∘\circ∘ C

Question 9

What is the molar volume of an ideal gas at 1.00 bar and 0.00 ∘\circ∘ C?

Accepted Answer

A)  22.4 L
B)  22.7 L
C)  22.1 L
D)  15.0 L
E)  27.2 L

Question 10

The following graph shows the speed distributions for four different gases,all at the same temperature.Which of the curves is for the lightest gas?

Accepted Answer

A)  a
B)  b
C)  c
D)  d
E)  more information is needed

Question 11

Which of the following statements regarding the mixing of gases is correct?

Accepted Answer

A)  More massive gases settle to the bottom of a container,leaving lighter gases near the top.
B)  The relative proportions of gases in a mixture vary throughout the container,depending on the pressure.
C)  Nonpolar gases do not mix with polar gases.
D)  All gas mixtures are homogeneous.
E)  Gases mix more uniformly at lower temperatures.

Question 12

Which of the gas samples shown below in identical containers has the lowest density (g/L) ?

Accepted Answer

A)   
B)   
C)   
D)   
E)  they have equal densities

Question 13

What pressure (in Pa)will be exerted on the bottom of a 63.5 kg hiker's foot when she stands on a rusty nail? Assume the diameter of the tip of the nail is 1.00 mm.The acceleration due to gravity is 9.81 m/s2.Recall that the area of a circle is A = $\pi$r2 and that 1 Pa = 1 kg m-1 s-2.

Accepted Answer

7.93 <img  loading="lazy" src="/assets/images/blured-textbook.svg" class="d-inline m-1" alt="blured image" width="139" height="30"> 10<s...

Question 14

In an experiment,564 g N2O gas (44.01 g/mol)are placed in a 75.0 L flask and -20.00S1U1P1$\circ$S1S1P0C.What is the pressure?

Accepted Answer

The answer of In an experiment,564 g N2O gas (44.01...

Question 15

In an experiment,2.000 grams of an unknown gas exert a pressure of 0.8876 atm in a 1.250 L container at 25.00S1U1P1$\circ$S1S1P0C.What is the molar mass of the gas? Is the gas propane (C3H8)or propylene (C3H6)?

Accepted Answer

The calculated molar...

Question 16

In an experiment,7.5 mol of chlorine gas are held in a 3.5 L container at 39 ∘\circ∘ C.What pressure does the gas exert if it is assumed to be ideal?

Accepted Answer

A)  5.5  ×	imes×  103 atm
B)  2.9  ×	imes×  104 atm
C)  6.9 atm
D)  55 atm
E)  96 atm

Question 17

Calcium carbonate (100.1 g/mol) decomposes according to the following reaction: CaCO3(s)  →	o→  CaO(s) + CO2(g) 
What pressure of CO2 gas will form in a 25.0 mL jar containing 5.00 g CaCO3 at 300 K if 0.00500% of the solid decomposes?

Accepted Answer

A)  0.246 atm
B)  2.46 atm
C)  1.00 atm
D)  2.46  ×	imes×  103 atm
E)  2.46  ×	imes×  10-3 atm

Question 18

Which of the following statements regarding the density of gases is NOT correct?

Accepted Answer

A)  The density of a gas is inversely proportional to its molar mass.
B)  As the temperature goes up,the density of a gas does down.
C)  The gas phase of a substance has a much lower density than the liquid or solid phase.
D)  As volume increases,density decreases.
E)  If the pressure on a gas increases,its density increases.

Question 19

Two identical cement blocks are placed on a glass table in different positions,as shown in the diagram.Which statement about these blocks is correct?

Accepted Answer

A)  A exerts more pressure on the table.
B)  B exerts more pressure on the table.
C)  Both blocks exert the same pressure on the table.
D)  A exerts more force on the table.
E)  B exerts more force on the table.

Question 20

Which set of gases is listed from fastest to slowest diffusion rate?

Accepted Answer

A)  N2 > NH3 > Ne > OF2
B)  NH3 > Ne > N2 > OF2
C)  OF2 > N2 > Ne > NH3
D)  N2 > Ne > OF2 > NH3
E)  NH3 > N2 > Ne > OF2

Exam 10: Properties of Gases-The Air We Breathe

The following graph shows the speed distributions for four different gases,all at the same temperature.Which of the curves is for the lightest gas?

Correct AnswerverifiedShow Answer

At the top of Mt.Everest,which has a height of 29,029 ft,atmospheric pressure is about 265 torr.Which of the following is NOT equivalent to 265 torr?

Correct AnswerverifiedShow Answer

Which set of gases is listed from fastest to slowest diffusion rate?

Correct AnswerverifiedShow Answer

Calcium carbonate (100.1 g/mol) decomposes according to the following reaction: CaCO3(s) →\to→ CaO(s) + CO2(g) What pressure of CO2 gas will form in a 25.0 mL jar containing 5.00 g CaCO3 at 300 K if 0.00500% of the solid decomposes?

Correct AnswerverifiedShow Answer

What is the root-mean-square speed of a carbon monoxide molecule in a sample of gas with an average kinetic energy of 3.41 kJ/mol?

Correct AnswerverifiedShow Answer

What is the molar volume of an ideal gas at 1.00 bar and 0.00 ∘\circ∘ C?

Correct AnswerverifiedShow Answer

In an experiment,2.000 grams of an unknown gas exert a pressure of 0.8876 atm in a 1.250 L container at 25.00 ∘\circ∘ C.What is the molar mass of the gas? Is the gas propane (C3H8)or propylene (C3H6)?

Correct AnswerverifiedThe calculated molar...View AnswerShow Answer

What is the average kinetic energy (in kJ/mol) of nitrous oxide (N2O) molecules at 30.0 ∘\circ∘ C?

Correct AnswerverifiedShow Answer

Indicate the gas with the greatest density at STP.

Correct AnswerverifiedShow Answer

A 1.50 mol sample of He occupies a volume of 2.50 L at a pressure of 14.7 atm.What will be the pressure of a 1.50 mol sample of H2 gas under the same conditions?

Correct AnswerverifiedShow Answer

Which of the following statements regarding the density of gases is NOT correct?

Correct AnswerverifiedShow Answer

On a given day,the atmospheric pressure is reported to be 30.8 in.of mercury.Using 1 atm as normal atmospheric pressure,this day would be classified as __________

Correct AnswerverifiedShow Answer

In an experiment,564 g N2O gas (44.01 g/mol)are placed in a 75.0 L flask and -20.00 ∘\circ∘ C.What is the pressure?

Correct AnswerverifiedShow Answer

What pressure (in Pa)will be exerted on the bottom of a 63.5 kg hiker's foot when she stands on a rusty nail? Assume the diameter of the tip of the nail is 1.00 mm.The acceleration due to gravity is 9.81 m/s2.Recall that the area of a circle is A = π\piπ r2 and that 1 Pa = 1 kg m-1 s-2.

Correct Answerverified7.93 10View AnswerShow Answer

Two identical cement blocks are placed on a glass table in different positions,as shown in the diagram.Which statement about these blocks is correct?

Correct AnswerverifiedShow Answer

The van der Waals constants for methane are a = 2.25 L2 .atm/mol2 and b = 0.0428 L/mol.What is the apparent temperature of 1.0000 mol CH4 in a 10.000 L container when it is treated as real relative to the same amount of gas in an identical container at -120.00 ∘\circ∘ C?

Correct AnswerverifiedShow Answer

A sample of gas at -15.0 ∘\circ∘ C is heated in a constant volume container until the pressure is 65.0% higher than its original value.What is the final temperature of the gas?

Correct AnswerverifiedShow Answer

Which of the following statements regarding the mixing of gases is correct?

Correct AnswerverifiedShow Answer

Which of the gas samples shown below in identical containers has the lowest density (g/L) ?

Correct AnswerverifiedShow Answer

In an experiment,7.5 mol of chlorine gas are held in a 3.5 L container at 39 ∘\circ∘ C.What pressure does the gas exert if it is assumed to be ideal?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Calcium carbonate (100.1 g/mol) decomposes according to the following reaction: CaCO₃(s) $\to$ CaO(s) + CO₂(g) What pressure of CO₂ gas will form in a 25.0 mL jar containing 5.00 g CaCO₃ at 300 K if 0.00500% of the solid decomposes?

Correct Answer
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Correct Answer
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What is the molar volume of an ideal gas at 1.00 bar and 0.00^$\circ$C?

Correct Answer
verified

In an experiment,2.000 grams of an unknown gas exert a pressure of 0.8876 atm in a 1.250 L container at 25.00^$\circ$C.What is the molar mass of the gas? Is the gas propane (C₃H₈)or propylene (C₃H₆)?

Correct Answer
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The calculated molar...
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What is the average kinetic energy (in kJ/mol) of nitrous oxide (N₂O) molecules at 30.0^$\circ$C?

Correct Answer
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Correct Answer
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A 1.50 mol sample of He occupies a volume of 2.50 L at a pressure of 14.7 atm.What will be the pressure of a 1.50 mol sample of H₂ gas under the same conditions?

Correct Answer
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Correct Answer
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Correct Answer
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In an experiment,564 g N₂O gas (44.01 g/mol)are placed in a 75.0 L flask and -20.00^$\circ$C.What is the pressure?

Correct Answer
verified

What pressure (in Pa)will be exerted on the bottom of a 63.5 kg hiker's foot when she stands on a rusty nail? Assume the diameter of the tip of the nail is 1.00 mm.The acceleration due to gravity is 9.81 m/s².Recall that the area of a circle is A = $\pi$ r² and that 1 Pa = 1 kg m^-¹ s^-².

Correct Answer
verified
7.93 10
View Answer

Correct Answer
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The van der Waals constants for methane are a = 2.25 L² .atm/mol² and b = 0.0428 L/mol.What is the apparent temperature of 1.0000 mol CH₄ in a 10.000 L container when it is treated as real relative to the same amount of gas in an identical container at -120.00^$\circ$C?

Correct Answer
verified

A sample of gas at -15.0^$\circ$C is heated in a constant volume container until the pressure is 65.0% higher than its original value.What is the final temperature of the gas?

Correct Answer
verified

Correct Answer
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Correct Answer
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In an experiment,7.5 mol of chlorine gas are held in a 3.5 L container at 39^$\circ$C.What pressure does the gas exert if it is assumed to be ideal?

Correct Answer
verified