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Exam 5: Gases and the Kinetic-Molecular Theory

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Question 41

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A sample of carbon dioxide gas at 125 $\degree$ C and 248 torr occupies a volume of 275 L. What will the gas pressure be if the volume is increased to 321 L at 125 $\degree$ C?

A) 212 torr
B) 289 torr
C) 356 torr
D) 441 torr
E) 359 torr

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

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Question 42

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Which of the following gases effuses most rapidly?

A) nitrogen
B) oxygen
C) hydrogen chloride
D) ammonia
E) carbon monoxide

F) A) and D)
G) C) and D)

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Question 43

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A sample of the inert gas krypton has its pressure tripled while its temperature remained constant. If the original volume is 12 L, what is the final volume?

The air pressure in a volleyball is 75 psi. What is this pressure in torr?

Ima Chemist found the density of Freon-11 (CFCl₃) to be 5.58 g/L under her experimental conditions. Her measurements showed that the density of an unknown gas was 4.38 g/L under the same conditions. What is the molar mass of the unknown?

According to the postulates of kinetic-molecular theory, the average kinetic energy of gas molecules is proportional to the absolute temperature.

Which of the lines on the figure below is the best representation of the relationship between the volume of a gas and its Celsius temperature, other factors remaining constant?

State Boyle's 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 500-mL sample of argon at 800 torr has its absolute temperature quadrupled. If the volume remains unchanged what is the new pressure?

What are the conditions of STP?

at 300. K?

Select the gas with the largest root-mean-square molecular speed at 25 $\degree$ C.

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 $\degree$ C and 1.35 atm. What would be its volume at 468 $\degree$ C and 1.35 atm?

If the molecular mass of a gas increases by a factor of 4 at constant temperature, its rms speed will

The pressure of hydrogen sulfide gas in a container is 35,650 Pa. What is this pressure in torr?

The temperature of the carbon dioxide atmosphere near the surface of Venus is 475 $\degree$ C. Calculate the average kinetic energy per mole of carbon dioxide molecules on Venus.

Linolenic acid (C₁₈H₃₀O₂) can be hydrogenated to stearic acid by reacting it with hydrogen gas according to the equation: C₁₈H₃₀O₂ + 3H₂ $\rightarrow$ C₁₈H₃₆O₂ What volume of hydrogen gas, measured at STP, is required to react with 10.5 g of linolenic acid in this reaction?

A sample of nitrogen gas at 298 K and 745 torr has a volume of 37.42 L. What volume will it occupy if the pressure is increased to 894 torr at constant temperature?

A sample of propane, a component of LP gas, has a volume of 35.3 L at 315 K and 922 torr. What is its volume at STP?

According to the postulates of kinetic-molecular theory, the molecules of all gases at a given temperature have the same average speed.