Question 1

Air pressure at the top of a very high mountain was measured as 250 mm Hg. What is the pressure?

Accepted Answer

0.329 atm

Question 2

A gas mixture is 50.00% helium and 50.00% methane, by volume. What is the mole fraction of methane in the mixture?

Accepted Answer

A) 0.1997 
B) 0.2005 
C) 0.2500 
D) 0.5000 
E) 0.8003 
A) 0.1997 
B) 0.2005 
C) 0.2500 
D) 0.5000 
E) 0.8003 D

Question 3

Whipped cream in a can contains whipped cream and carbon dioxide.

Accepted Answer

A) True 
 B)False  False

Question 4

Even though the average speed of a carbon monoxide molecule is greater than that of a sulfur dioxide molecule at the same temperature, the average kinetic energy of the molecules is the same.

Accepted Answer

A) True 
 B)False

Question 5

Air pressure at the bottom of a deep mine shaft is the same as the air pressure at the earth's surface next at the shaft opening.

Accepted Answer

A) True 
 B)False

Question 6

The van der Waals equation of state for a real gas is   In this equation, the van der Waals constant, b, represents a correction for

Accepted Answer

A) a positive deviation in the measured value of V from that for an ideal gas due to the finite volume of space occupied by molecules of a real gas. 
B) a negative deviation in the measured value of V from that for an ideal gas due
To the finite volume of space occupied by molecules of a real gas. 
C) a positive deviation in the measured value of V from that for an ideal gas due to the attractive forces between the molecules of a real gas. 
D) a negative deviation in the measured value of V from that for an ideal gas due to the attractive forces between the molecules of a real gas. 
E) a positive deviation in the measured value of V from that for an ideal gas due to the finite mass of the molecules of a real gas. 
A) a positive deviation in the measured value of V from that for an ideal gas due to the finite volume of space occupied by molecules of a real gas. 
B) a negative deviation in the measured value of V from that for an ideal gas due
To the finite volume of space occupied by molecules of a real gas. 
C) a positive deviation in the measured value of V from that for an ideal gas due to the attractive forces between the molecules of a real gas. 
D) a negative deviation in the measured value of V from that for an ideal gas due to the attractive forces between the molecules of a real gas. 
E) a positive deviation in the measured value of V from that for an ideal gas due to the finite mass of the molecules of a real gas.

Question 7

Why do a person's ears "pop"when changing altitude in an airplane?

Accepted Answer

As the airplane climbs higher in altitud

Question 8

What are the values for standard temperature and pressure (STP)in units of Kelvin and atmospheres?

Accepted Answer

The answer of What are the values for standard temperature...

Question 9

A sample of a gas occupies a volume of 1.246 liters at STP. It was placed in a different vessel with a volume of 1.410 liters, in which the pressure was measured as 108.5 kPa. What is its temperature in this new vessel?

Accepted Answer

A) -47.7 °C 
B) -14.7 °C 
C) +15.5 °C 
D) +57.8 °C 
E) +88.1 °C 
A) -47.7 °C 
B) -14.7 °C 
C) +15.5 °C 
D) +57.8 °C 
E) +88.1 °C

Question 10

The product,   for a real gas.

Accepted Answer

The answer of The product,   for a real...

Question 11

A sample of hydrogen gas is placed in a solid steel chamber (rigid walls)with a volume of 4.25 L. The sample starts at a temperature of 25.0°C and pressure of 1.00 atm. What would be the final pressure if gas sample is cooled to a new temperature of -25°C?

Accepted Answer

The answer of A sample of hydrogen gas is placed...

Question 12

People who live on the second floor of apartment buildings often save money on their home-heating costs. Based on the properties of gases, provide an explanation for this.

Accepted Answer

Air expands as it warms. Therefore, warm

Question 13

The van der Waals equation of state for a real gas is   In this equation, the van der Waals constant, a, represents a correction for

Accepted Answer

A) a positive deviation in the measured value of P from that for an ideal gas due to the finite volume of space occupied by molecules of a real gas. 
B) a negative deviation in the measured value of P from that for an ideal gas due to the finite volume of space occupied by molecules of a real gas. 
C) a positive deviation in the measured value of P from that for an ideal gas due to the attractive forces between the molecules of a real gas. 
D) a negative deviation in the measured value of P from that for an ideal gas due to the attractive forces between the molecules of a real gas. 
E) a positive deviation in the measured value of P from that for an ideal gas due to the finite mass of the molecules of a real gas. 
A) a positive deviation in the measured value of P from that for an ideal gas due to the finite volume of space occupied by molecules of a real gas. 
B) a negative deviation in the measured value of P from that for an ideal gas due to the finite volume of space occupied by molecules of a real gas. 
C) a positive deviation in the measured value of P from that for an ideal gas due to the attractive forces between the molecules of a real gas. 
D) a negative deviation in the measured value of P from that for an ideal gas due to the attractive forces between the molecules of a real gas. 
E) a positive deviation in the measured value of P from that for an ideal gas due to the finite mass of the molecules of a real gas.

Question 14

A gas sample containing 0.3525 moles of a compound is trapped in a 2.641 liter vessel at a temperature of 28.4 °C. What is the pressure in the vessel if the gas behaves as an ideal gas?

Accepted Answer

A) 334.6 torr 
B) 2007 torr 
C) 2510 torr 
D) 2513 torr 
E) 2694 torr 
A) 334.6 torr 
B) 2007 torr 
C) 2510 torr 
D) 2513 torr 
E) 2694 torr

Question 15

A gas container has a volume of 6.504 L. When filled with propane gas, C3H8, at 28.3 °C, the pressure is 486.3 torr. How much should the gas sample weigh?

Accepted Answer

A) 4.67 g 
B) 7.41 g 
C) 7.52 g 
D) 18.1 g 
E) 263 g 
A) 4.67 g 
B) 7.41 g 
C) 7.52 g 
D) 18.1 g 
E) 263 g

Question 16

In a gas mixture containing oxygen, neon, and argon, the mole fractions are:   If this mixture behaves as an ideal gas, what is the density of this mixture, in g/liter, at 37.0 °C and 765 torr? If someone gave a sample of the mix described above to a student and had them determine the molar mass of the "gas"without telling the student it was a mixture, what value should the student report?

Accepted Answer

1.11 g L⁻¹,

Question 17

A sealed glass container contains 0.8 moles of O2 gas and 0.4 moles of N2 gas. If the total pressure inside the container is 0.90 atm, what is the partial pressure of O2 in theglass container?

Accepted Answer

A) 0.40 atm 
B) 0.90 atm 
C) 0.60 atm 
D) 0.67 atm 
E) 0.30 atm 
A) 0.40 atm 
B) 0.90 atm 
C) 0.60 atm 
D) 0.67 atm 
E) 0.30 atm

Question 18

A properly designed Torricelli mercury barometer should be at least

Accepted Answer

A) 500 mm tall. 
B) 800 mm tall. 
C) 250 mm tall. 
D) 100 mm tall. 
E) 76 mm tall. 
A) 500 mm tall. 
B) 800 mm tall. 
C) 250 mm tall. 
D) 100 mm tall. 
E) 76 mm tall.

Question 19

A U.S. Weather Bureau forecast cited the atmospheric pressure at sea level as having a value of 768.2 mm Hg. What would the value be in kPa? (1 atm = 101325 Pa = 760 torr = 760 mm Hg = 1.01325 bar = 1013.25 mb)

Accepted Answer

A) 778.4 kPa 
B) 102.4 kPa 
C) 100.3 kPa 
D) 91.62 kPa 
E) 1024 kPa 
A) 778.4 kPa 
B) 102.4 kPa 
C) 100.3 kPa 
D) 91.62 kPa 
E) 1024 kPa

Question 20

Five moles of oxygen gas are heated from 25°C to 100°C in a constant volume container. At this new temperature, the density of the oxygen gas will be ________ that at the initial temperature.

Accepted Answer

The answer of Five moles of oxygen gas are heated...

Exam 11: Properties of Gases

Air pressure at the top of a very high mountain was measured as 250 mm Hg. What is the pressure?

A gas mixture is 50.00% helium and 50.00% methane, by volume. What is the mole fraction of methane in the mixture?

Whipped cream in a can contains whipped cream and carbon dioxide.

Even though the average speed of a carbon monoxide molecule is greater than that of a sulfur dioxide molecule at the same temperature, the average kinetic energy of the molecules is the same.

Air pressure at the bottom of a deep mine shaft is the same as the air pressure at the earth's surface next at the shaft opening.

The van der Waals equation of state for a real gas is In this equation, the van der Waals constant, b, represents a correction for

Why do a person's ears "pop"when changing altitude in an airplane?

What are the values for standard temperature and pressure (STP)in units of Kelvin and atmospheres?

A sample of a gas occupies a volume of 1.246 liters at STP. It was placed in a different vessel with a volume of 1.410 liters, in which the pressure was measured as 108.5 kPa. What is its temperature in this new vessel?

The product, for a real gas.

A sample of hydrogen gas is placed in a solid steel chamber (rigid walls)with a volume of 4.25 L. The sample starts at a temperature of 25.0°C and pressure of 1.00 atm. What would be the final pressure if gas sample is cooled to a new temperature of -25°C?

People who live on the second floor of apartment buildings often save money on their home-heating costs. Based on the properties of gases, provide an explanation for this.

The van der Waals equation of state for a real gas is In this equation, the van der Waals constant, a, represents a correction for

A gas sample containing 0.3525 moles of a compound is trapped in a 2.641 liter vessel at a temperature of 28.4 °C. What is the pressure in the vessel if the gas behaves as an ideal gas?

A gas container has a volume of 6.504 L. When filled with propane gas, C3H8, at 28.3 °C, the pressure is 486.3 torr. How much should the gas sample weigh?

A sealed glass container contains 0.8 moles of O2 gas and 0.4 moles of N2 gas. If the total pressure inside the container is 0.90 atm, what is the partial pressure of O2 in theglass container?

A properly designed Torricelli mercury barometer should be at least

A U.S. Weather Bureau forecast cited the atmospheric pressure at sea level as having a value of 768.2 mm Hg. What would the value be in kPa? (1 atm = 101325 Pa = 760 torr = 760 mm Hg = 1.01325 bar = 1013.25 mb)

Five moles of oxygen gas are heated from 25°C to 100°C in a constant volume container. At this new temperature, the density of the oxygen gas will be ________ that at the initial temperature.

A Very Brief History of Chemistry

Scientific Measurements

Elements, Compounds, and the Periodic Table

The Mole and Stoichiometry

Molecular View of Reactions in Aqueous Solutions

Oxidation-Reduction Reactions

Energy and Chemical Change

The Quantum Mechanical Atom

The Basics of Chemical Bonding

Theories of Bonding and Structure

Intermolecular Attractions and the Properties of Liquids and Solids

Mixtures at the Molecular Level: Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases, a Molecular Look

Acid-Base Equilibria in Aqueous Solutions

Solubility and Simultaneous Equilibria

Thermodynamics

Electrochemistry

Nuclear Reactions and Their Role in Chemistry

Metal Complexes

Organic Compounds, Polymers, and Biochemicals

Filters

A gas container has a volume of 6.504 L. When filled with propane gas, C₃H₈, at 28.3 °C, the pressure is 486.3 torr. How much should the gas sample weigh?

A sealed glass container contains 0.8 moles of O₂ gas and 0.4 moles of N₂ gas. If the total pressure inside the container is 0.90 atm, what is the partial pressure of O₂ in theglass container?