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Exam 5: Gases and the Kinetic-Molecular Theory

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Question 41

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

A) 520 torr
B) 562 torr
C) 3900 torr
D) 7600 torr
E) 75000 torr

F) All of the above
G) A) and B)

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Question 42

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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.

A) 2520 J/mol
B) 4150 J/mol
C) 5920 J/mol
D) 9330 J/mol
E) 5920 kJ/mol

F) A) and B)
G) All of the above

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Question 43

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at 300. K?

Which of the following gases effuses most rapidly?

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

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

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?

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?

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?

What are the conditions of STP?

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

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?

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

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?

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?

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?

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

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

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 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?