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Exam 8: Gases

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Question 31

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A gas sample contains 4.0 g of CH₄ and 2.0 g of He.What is the volume of the sample at STP?

A) 130 L
B) 11 L
C) 17 L
D) 30.L
E) 5.6 L

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Question 32

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A barometer is usually filled with ________.

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Question 33

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At constant temperature,a sample of helium at 760.torr in a closed container was compressed from 5.00 L to 3.00 L.What was the new pressure exerted by the helium on its container?

In Gay-Lussac's law,the pressure of a gas increases due to an increase in temperature because ________.

The force of gas particles against the walls of a container is called ________.

A balloon is filled with helium gas.For the following question(s) ,select the letter of the balloon diagram that corresponds to the given change in conditions. -The balloon is put into a chamber where the pressure is less than the atmospheric pressure.

A sample of argon at 300.°C and 50.0 atm pressure is cooled in the same container to a temperature of 0 °C What is the new pressure,if the volume and amount of gas do not change?

A sample of nitrogen gas had a volume of 500.mL,a pressure in its closed container of 740 torr,and a temperature of 25 °C.What was the new volume of the gas when the temperature was changed to 50 °C and the new pressure was 760 torr,if the amount of gas does not change?

At 570.mmHg and 25 °C,a gas sample has a volume of 2270 mL.What is the final pressure (in mmHg) at a volume of 1250 mL and a temperature of 175 °C,if the amount of gas does not change?

A gas has a pressure of 540.torr when the temperature is 127 °C.When the temperature changes to 27 °C,what is the new pressure,if there is no change in volume or amount of gas?

A balloon is filled with helium gas.For the following question(s) ,select the letter of the balloon diagram that corresponds to the given change in conditions. -The temperature is changed from 50 °C to -150 °C at constant pressure.

According to Avogadro's law,________.

Which measurement describes the pressure of a gas?

The pressure exerted by a gas on its container is inversely related to its Kelvin temperature.

Nitrogen makes up about ________ percent of the atmosphere.

The total pressure of a mixture of CO2 and O2 is 780 mmHg.If the pressure of the CO2 is 560.torr,what is the pressure of O2?

At STP,what is the volume of 4.50 moles of nitrogen gas?

A gas has a volume of 46.0 L when the temperature is 400.K.When the temperature changes to 500.K,what is the new volume,if there is no change in pressure or amount of gas?

The volume decreases as the temperature increases,if pressure and amount of gas do not change.

According to the kinetic molecular theory of gases,a gas can be compressed much more than a liquid or solid because ________.