Exam 5: Gases and the Kinetic-Molecular Theory

State Charles' Law and illustrate it with a graph,using standard x-y coordinate axes.Be sure to label the axes unambiguously with the correct gas variables.

(Essay)

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Question 21

Which of the lines on the figure below is the best representation of the relationship between the volume and the number of moles of a gas,measured at constant temperature and pressure?

(Multiple Choice)

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Question 22

"The pressure of an ideal gas is inversely proportional to its volume at constant temperature and number of moles" is a statement of __________________ Law.

(Multiple Choice)

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Question 23

A carbon dioxide sample weighing 44.0 g occupies 32.68 L at 65°C and 645 torr.What is its volume at STP?

(Multiple Choice)

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Question 24

A 0.850-mole sample of nitrous oxide,a gas used as an anesthetic by dentists,has a volume of 20.46 L at 123°C and 1.35 atm.What would be its volume at 468°C and 1.35 atm?

(Multiple Choice)

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Question 25

A compressed gas cylinder containing 1.50 mol methane has a volume of 3.30 L.What pressure does the methane exert on the walls of the cylinder if its temperature is 25°C?

(Multiple Choice)

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Question 26

If 0.750 L of argon at 1.50 atm and 177°C and 0.235 L of sulfur dioxide at 95.0 kPa and 63.0°C are added to a 1.00-L flask and the flask's temperature is adjusted to 25.0°C,what is the resulting pressure in the flask?

(Multiple Choice)

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Question 27

A flask with a volume of 3.16 L contains 9.33 grams of an unknown gas at 32.0°C and 1.00 atm.What is the molar mass of the gas?

(Multiple Choice)

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Question 28

Use plots of PV/nRT versus P to show the behavior of an ideal gas and of typical real gases.Label the axes and show their scales.

(Essay)

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Question 29

Calculate the temperature of an argon sample at 55.4 kPa and 18.6 L if it occupies 25.8 L at 75.0°C and 41.1 kPa.

(Multiple Choice)

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Question 30

Dr.I.M.A.Brightguy adds 0.1727 g of an unknown gas to a 125-mL flask.If Dr.B finds the pressure to be 736 torr at 20.0°C,is the gas likely to be methane,CH₄,nitrogen,N₂,oxygen,O₂,neon,Ne,or argon,Ar?

(Multiple Choice)

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Question 31

A gas mixture consists of equal masses of methane (molecular weight 16.0)and argon (atomic weight 40.0).If the partial pressure of argon is 200.torr,what is the pressure of methane,in torr?

(Multiple Choice)

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Question 32

Briefly state the conditions corresponding to STP (standard temperature and pressure).

(Essay)

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Question 33

A sample of an ideal gas has its volume doubled while its temperature remains constant.If the original pressure was 100 torr,what is the new pressure?

(Multiple Choice)

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Question 34

For an ideal gas,a plot of PV/nRT versus P gives a straight line with a positive slope.

(True/False)

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Question 35

From the postulates of kinetic-molecular theory,it follows that the molecules of all gases at a given temperature have the same average speed.

(True/False)

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Question 36

From the postulates of kinetic-molecular theory,it follows that the molecules of all gases at a given temperature have the same average kinetic energy.

(True/False)

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Question 37

The average kinetic energy of gas molecules is proportional to the absolute temperature.

(True/False)

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Question 38

An oxygen sample of 1.62 L is at 92.3 kPa and 30.0°C. a.What is the pressure of oxygen,in torr? b.What volume would the oxygen occupy if the pressure were 120.0 kPa and the temperature were 0.0°C? c.How many moles of oxygen are in the sample?

(Essay)

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Question 39

Methane,CH₄(g),reacts with steam to give synthesis gas,a mixture of carbon monoxide and hydrogen,which is used as starting material for the synthesis of a number of organic and inorganic compounds. CH₄(g)+ H₂O(g) $\to$ CO(g)+ H₂(g)[unbalanced] What mass of hydrogen is formed if 275 L of methane (measured at STP)is converted to synthesis gas?

(Multiple Choice)

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Question 40

Showing 21 - 40 of 93

Exam 5: Gases and the Kinetic-Molecular Theory

State Charles' Law and illustrate it with a graph,using standard x-y coordinate axes.Be sure to label the axes unambiguously with the correct gas variables.

Which of the lines on the figure below is the best representation of the relationship between the volume and the number of moles of a gas,measured at constant temperature and pressure?

"The pressure of an ideal gas is inversely proportional to its volume at constant temperature and number of moles" is a statement of __________________ Law.

A carbon dioxide sample weighing 44.0 g occupies 32.68 L at 65°C and 645 torr.What is its volume at STP?

A 0.850-mole sample of nitrous oxide,a gas used as an anesthetic by dentists,has a volume of 20.46 L at 123°C and 1.35 atm.What would be its volume at 468°C and 1.35 atm?

A compressed gas cylinder containing 1.50 mol methane has a volume of 3.30 L.What pressure does the methane exert on the walls of the cylinder if its temperature is 25°C?

If 0.750 L of argon at 1.50 atm and 177°C and 0.235 L of sulfur dioxide at 95.0 kPa and 63.0°C are added to a 1.00-L flask and the flask's temperature is adjusted to 25.0°C,what is the resulting pressure in the flask?

A flask with a volume of 3.16 L contains 9.33 grams of an unknown gas at 32.0°C and 1.00 atm.What is the molar mass of the gas?

Use plots of PV/nRT versus P to show the behavior of an ideal gas and of typical real gases.Label the axes and show their scales.

Calculate the temperature of an argon sample at 55.4 kPa and 18.6 L if it occupies 25.8 L at 75.0°C and 41.1 kPa.

Dr.I.M.A.Brightguy adds 0.1727 g of an unknown gas to a 125-mL flask.If Dr.B finds the pressure to be 736 torr at 20.0°C,is the gas likely to be methane,CH4,nitrogen,N2,oxygen,O2,neon,Ne,or argon,Ar?

A gas mixture consists of equal masses of methane (molecular weight 16.0)and argon (atomic weight 40.0).If the partial pressure of argon is 200.torr,what is the pressure of methane,in torr?

Briefly state the conditions corresponding to STP (standard temperature and pressure).

A sample of an ideal gas has its volume doubled while its temperature remains constant.If the original pressure was 100 torr,what is the new pressure?

For an ideal gas,a plot of PV/nRT versus P gives a straight line with a positive slope.

From the postulates of kinetic-molecular theory,it follows that the molecules of all gases at a given temperature have the same average speed.

From the postulates of kinetic-molecular theory,it follows that the molecules of all gases at a given temperature have the same average kinetic energy.

The average kinetic energy of gas molecules is proportional to the absolute temperature.

An oxygen sample of 1.62 L is at 92.3 kPa and 30.0°C. a.What is the pressure of oxygen,in torr? b.What volume would the oxygen occupy if the pressure were 120.0 kPa and the temperature were 0.0°C? c.How many moles of oxygen are in the sample?

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids,solids,and Phase Changes

The Properties of Solutions

The Main-Group Elements: Applying Principles of Bonding and Structure

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

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Dr.I.M.A.Brightguy adds 0.1727 g of an unknown gas to a 125-mL flask.If Dr.B finds the pressure to be 736 torr at 20.0°C,is the gas likely to be methane,CH₄,nitrogen,N₂,oxygen,O₂,neon,Ne,or argon,Ar?