Question 1

Absolute zero is the point at which

Accepted Answer

A) a straight-line graph of V versus T (°
C) intersects the origin. 
B) a straight-line graph of 1/V versus P at constant T intersects the origin. 
C) gaseous helium liquefies. 
D) a straight-line graph of V versus 1/P at constant T intersects the origin. 
E) a straight-line graph of V versus T (K)intersects the origin. 
A) a straight-line graph of V versus T (°
C) intersects the origin. 
B) a straight-line graph of 1/V versus P at constant T intersects the origin. 
C) gaseous helium liquefies. 
D) a straight-line graph of V versus 1/P at constant T intersects the origin. 
E) a straight-line graph of V versus T (K)intersects the origin.

Question 2

What is the volume occupied by a mixture of 0.774 mol of N2 and 0.774 mol of O2 gases at 1.04 atm and 25.6°C?

Accepted Answer

A) 1.1 × 103 L 
B) 36.5 L 
C) 1.56 L 
D) 3.12 L 
E) 18.2 L 
A) 1.1 × 103 L 
B) 36.5 L 
C) 1.56 L 
D) 3.12 L 
E) 18.2 L

Question 3

The behavior of PH3(g)is most likely to approach ideal behavior at

Accepted Answer

A) 1.0 atm and 100°C. 
B) 0.10 atm and -100°C. 
C) 10 atm and 100°C. 
D) 0.10 atm and 100°C. 
E) 1.0 atm and 0°C. 
A) 1.0 atm and 100°C. 
B) 0.10 atm and -100°C. 
C) 10 atm and 100°C. 
D) 0.10 atm and 100°C. 
E) 1.0 atm and 0°C.

Question 4

Under what set of conditions does HCl(g)deviate the most from ideal behavior?

Accepted Answer

A) standard temperature and pressure 
B) high temperature and low pressure 
C) low temperature and high pressure 
D) low temperature and low pressure 
E) high temperature and high pressure 
A) standard temperature and pressure 
B) high temperature and low pressure 
C) low temperature and high pressure 
D) low temperature and low pressure 
E) high temperature and high pressure

Question 5

A flexible container is charged with 79.00 L of gas at 352 Κ.Under conditions of constant pressure and moles of gas,what is the volume of the gas when the temperature is decreased by a factor of three?

Accepted Answer

A) 26.3 L 
B) 237 L 
C) 0.00421 L 
D) 79 L 
E) 11.8 L 
A) 26.3 L 
B) 237 L 
C) 0.00421 L 
D) 79 L 
E) 11.8 L

Question 6

Which of the following graphs does not correctly describe the ideal gas law?

Accepted Answer

A)    
B) They all correctly represent the ideal gas law. 
C)    
D)    
E)    
A)    
B) They all correctly represent the ideal gas law. 
C)    
D)    
E)

Question 7

A 15.6-g mixture of nitrogen and carbon dioxide is found to occupy a volume of 9.9 L when measured at 940.2 mmHg and 54.9°C.What is the mole fraction of carbon dioxide in this mixture?

Accepted Answer

A) 0.486 
B) 0.5 
C) 0.513 
D) 0.597 
E) 0.402 
A) 0.486 
B) 0.5 
C) 0.513 
D) 0.597 
E) 0.402

Question 8

Real gases deviate from ideal behavior for two reasons: (1)real gas molecules have intermolecular forces,and (2)real gas molecules have

Accepted Answer

A) pressures within the chemical bonds. 
B) nonzero molecular volumes. 
C) ionization energies. 
D) molecular vibrations. 
E) a distribution of molecular speeds. 
A) pressures within the chemical bonds. 
B) nonzero molecular volumes. 
C) ionization energies. 
D) molecular vibrations. 
E) a distribution of molecular speeds.

Question 9

The following gases are stored in identical flexible containers at 25°C and 1.00 atm pressure.Order the gases from highest to lowest density.
1)200 g propane,C3H8
2)100 g carbon dioxide,CO2
3)50 g nitrous oxide,N2O

Accepted Answer

A) 1 ≈ 2 ≈ 3 
B) 3 > 2 > 1 
C) 1 > 2 > 3 
D) 2 > 1> 3 
E) 1 > 2 ≈ 3 
A) 1 ≈ 2 ≈ 3 
B) 3 > 2 > 1 
C) 1 > 2 > 3 
D) 2 > 1> 3 
E) 1 > 2 ≈ 3

Question 10

The density of O2 gas at 16°C and 1.27 atm is

Accepted Answer

A) 31 g/L. 
B) 28.4 g/L. 
C) 1.71 g/L. 
D) 88.7 g/mL. 
E) 0.584 g/L. 
A) 31 g/L. 
B) 28.4 g/L. 
C) 1.71 g/L. 
D) 88.7 g/mL. 
E) 0.584 g/L.

Question 11

A particular gas exerts a pressure of 4.02 atm.What is this pressure in units of bar?

Accepted Answer

A) 3.06 × 103 bar 
B) 4.02 × 105 bar 
C) 4.07 bar 
D) 3.96 bar 
E) 5.29 × 10-3 bar 
A) 3.06 × 103 bar 
B) 4.02 × 105 bar 
C) 4.07 bar 
D) 3.96 bar 
E) 5.29 × 10-3 bar

Question 12

It is possible to make a barometer using a liquid other than mercury.What would be the height (in meters)of a column of dichloromethane at a pressure of 0.830 atm,given that 0.830 atm is equal to a 0.63522 m column of mercury and the densities of mercury and dichloromethane are 13.5 g/cm3 and 1.33 g/cm3,respectively.

Accepted Answer

A) 6.4641 m 
B) 0.156 m 
C) 0.0621 m 
D) 0.838 m 
E) 1.19 m 
A) 6.4641 m 
B) 0.156 m 
C) 0.0621 m 
D) 0.838 m 
E) 1.19 m

Question 13

Using the van der Waals equation,determine the pressure of 500.0 g of SO2(g)in a 6.30-L vessel at 633 K.For SO2(g),a = 6.865 L2 • atm/mol2 and b = 0.05679 L/mol.(R = 0.0821 L • atm/(K • mol))

Accepted Answer

A) 79.7 atm 
B) 8.49 atm 
C) 58.7 atm 
D) 64.3 atm 
E) 8.66 atm 
A) 79.7 atm 
B) 8.49 atm 
C) 58.7 atm 
D) 64.3 atm 
E) 8.66 atm

Question 14

Which of the following statements is incorrect regarding a 128-g sample of gaseous sulfur dioxide at 0°C and 760 mmHg pressure?

Accepted Answer

A) The density of the gas is 2.86 g/L. 
B) There are 2 × 6.02 × 1023 atoms of oxygen present. 
C) There are 2 mol of gas present. 
D) The molar mass of the gas is 64 g/mol. 
E) The volume of the gas is 44.8 L. 
A) The density of the gas is 2.86 g/L. 
B) There are 2 × 6.02 × 1023 atoms of oxygen present. 
C) There are 2 mol of gas present. 
D) The molar mass of the gas is 64 g/mol. 
E) The volume of the gas is 44.8 L.

Question 15

At 25°C and 449 mmHg,an unknown pure gas has a density of 0.676 g/L.Which of the following gases could be the unknown gas?

Accepted Answer

A) Cl2 
B) C3H6 
C) Cl2O 
D) Ne 
E) N2 
A) Cl2 
B) C3H6 
C) Cl2O 
D) Ne 
E) N2

Question 16

The pressure of a certain gas is measured to be 4.304 × 103 Pa.What is this pressure expressed in units of mmHg?​

Accepted Answer

A) ​5.589 × 10-5 mmHg 
B) ​3.271 × 106 mmHg 
C) ​3.098 × 10-2 mmHg 
D) ​32.28 mmHg 
E) ​1.789 × 104 mmHg 
A) ​5.589 × 10-5 mmHg 
B) ​3.271 × 106 mmHg 
C) ​3.098 × 10-2 mmHg 
D) ​32.28 mmHg 
E) ​1.789 × 104 mmHg

Question 17

Which of the following statements concerning gas molecules is incorrect?

Accepted Answer

A) Attraction is greater between fast-moving molecules than between slow-moving molecules. 
B) Real molecules have a weak attraction for each other. 
C) Real molecules have the greatest attraction for each other at low temperatures. 
D) Real molecules have the greatest attraction for each other at high pressures. 
E) Real molecules occupy a finite space. 
A) Attraction is greater between fast-moving molecules than between slow-moving molecules. 
B) Real molecules have a weak attraction for each other. 
C) Real molecules have the greatest attraction for each other at low temperatures. 
D) Real molecules have the greatest attraction for each other at high pressures. 
E) Real molecules occupy a finite space.

Question 18

A vessel with a volume of 12.4 L contains 2.80 g of nitrogen gas,0.403 g of hydrogen gas,and 79.9 g of argon gas.At 25°C,what is the pressure in the vessel?

Accepted Answer

A) 164 atm 
B) 256.2 atm 
C) 4.54 atm 
D) 0.380 atm 
E) 2.27 atm 
A) 164 atm 
B) 256.2 atm 
C) 4.54 atm 
D) 0.380 atm 
E) 2.27 atm

Question 19

The partial pressures of CH4,N2,and O2 in a sample of gas were found to be 183 mmHg,443 mmHg,and 693 mmHg,respectively.What is the mole fraction of nitrogen?

Accepted Answer

A) 21.7 
B) 0.912 
C) 0.525 
D) 0.410 
E) 0.336 
A) 21.7 
B) 0.912 
C) 0.525 
D) 0.410 
E) 0.336

Question 20

Molecular speed distributions for a gas at two different temperatures are shown below.Which of the following graphs correctly describes the distributions at the two temperatures,where T2 > T1? NOTE: The small vertical lines indicate average speed.

Accepted Answer

A)    
B)    
C)    
D)    
E) none of the above 
A)    
B)    
C)    
D)    
E) none of the above

Exam 5: The Gaseous State

Absolute zero is the point at which

What is the volume occupied by a mixture of 0.774 mol of N2 and 0.774 mol of O2 gases at 1.04 atm and 25.6°C?

The behavior of PH3(g)is most likely to approach ideal behavior at

Under what set of conditions does HCl(g)deviate the most from ideal behavior?

A flexible container is charged with 79.00 L of gas at 352 Κ.Under conditions of constant pressure and moles of gas,what is the volume of the gas when the temperature is decreased by a factor of three?

Which of the following graphs does not correctly describe the ideal gas law?

A 15.6-g mixture of nitrogen and carbon dioxide is found to occupy a volume of 9.9 L when measured at 940.2 mmHg and 54.9°C.What is the mole fraction of carbon dioxide in this mixture?

Real gases deviate from ideal behavior for two reasons: (1)real gas molecules have intermolecular forces,and (2)real gas molecules have

The following gases are stored in identical flexible containers at 25°C and 1.00 atm pressure.Order the gases from highest to lowest density. 1)200 g propane,C3H8 2)100 g carbon dioxide,CO2 3)50 g nitrous oxide,N2O

The density of O2 gas at 16°C and 1.27 atm is

A particular gas exerts a pressure of 4.02 atm.What is this pressure in units of bar?

Using the van der Waals equation,determine the pressure of 500.0 g of SO2(g)in a 6.30-L vessel at 633 K.For SO2(g),a = 6.865 L2 • atm/mol2 and b = 0.05679 L/mol.(R = 0.0821 L • atm/(K • mol))

Which of the following statements is incorrect regarding a 128-g sample of gaseous sulfur dioxide at 0°C and 760 mmHg pressure?

At 25°C and 449 mmHg,an unknown pure gas has a density of 0.676 g/L.Which of the following gases could be the unknown gas?

The pressure of a certain gas is measured to be 4.304 × 103 Pa.What is this pressure expressed in units of mmHg?​

Which of the following statements concerning gas molecules is incorrect?

A vessel with a volume of 12.4 L contains 2.80 g of nitrogen gas,0.403 g of hydrogen gas,and 79.9 g of argon gas.At 25°C,what is the pressure in the vessel?

The partial pressures of CH4,N2,and O2 in a sample of gas were found to be 183 mmHg,443 mmHg,and 693 mmHg,respectively.What is the mole fraction of nitrogen?

Molecular speed distributions for a gas at two different temperatures are shown below.Which of the following graphs correctly describes the distributions at the two temperatures,where T2 > T1? NOTE: The small vertical lines indicate average speed.

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What is the volume occupied by a mixture of 0.774 mol of N₂ and 0.774 mol of O₂ gases at 1.04 atm and 25.6°C?

The behavior of PH₃(g)is most likely to approach ideal behavior at

The following gases are stored in identical flexible containers at 25°C and 1.00 atm pressure.Order the gases from highest to lowest density. 1)200 g propane,C₃H₈ 2)100 g carbon dioxide,CO₂ 3)50 g nitrous oxide,N₂O

The density of O₂ gas at 16°C and 1.27 atm is

Using the van der Waals equation,determine the pressure of 500.0 g of SO₂(g)in a 6.30-L vessel at 633 K.For SO₂(g),a = 6.865 L² • atm/mol² and b = 0.05679 L/mol.(R = 0.0821 L • atm/(K • mol))

The pressure of a certain gas is measured to be 4.304 × 10³ Pa.What is this pressure expressed in units of mmHg?

The partial pressures of CH₄,N₂,and O₂ in a sample of gas were found to be 183 mmHg,443 mmHg,and 693 mmHg,respectively.What is the mole fraction of nitrogen?

Molecular speed distributions for a gas at two different temperatures are shown below.Which of the following graphs correctly describes the distributions at the two temperatures,where T₂ > T₁? NOTE: The small vertical lines indicate average speed.