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Exam 5: Gases and the Kinetic-Molecular Theory

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Question 21

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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?

A) 7.76 g/mol
B) 66.1 g/mol
C) 74.0 g/mol
D) 81.4 g/mol
E) 144 g/mol

F) A) and E)
G) A) and C)

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Question 22

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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.

A) True
B) False

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Question 23

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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.

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?

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?

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?

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

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.

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.

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?

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

"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 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?

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?

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

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?

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?

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

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