Confined Gases

Practice Problems
Confined Gases

Directions: On this worksheet you will be examining properties of a confined ideal gas.

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Question 1

Use the following information for question 1-6 on this worksheet.
An enclosed gas of 120 grams of argon gas (M = 40) follows the process 1

3 as shown.

T₁ = 30ºC and T₂ = 659ºC.

How many moles of helium are present in the container?

6 moles12 moles3 moles1.5 moles0.75 moles

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Question 2 In which process was heat removed from the gas?

1 2no heat was ever removed during the cycle2 33 1

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Question 3 What is the value of T₃?

1398.0 K621.3 K932.0 K386.0 K303.0 K

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Question 4 If P₁ equals 140 kPa, then what is the value of P₂?

431 kPa413 kPa280 kPa3075 kPa

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Question 5 What is the value of V₁?

4.61 x 10^-1 m³2.16 x 10³ m³1.85 x 10¹ m³5.34 x 10^-3 m³5.4 x 10^-2 m³

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Question 6 In which process was no work done on or by the gas?

3 11 22 3

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Question 7 The final three questions do NOT refer to the PV diagram shown in Question #1.

30 joules of heat energy are transferred to a sample of gas along path AC. As a result, the internal energy of the gas

increases by exactly 30 J increases by less than 30 J remains unchangedincreases by more than 30 J

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Question 8 9.0 grams of water vapor (M = 18.0) are confined in a cylindrical container having a movable, yet 'snuggly-fitting,' lid that slides up and down to accommodate changes in pressure and volume. What is the average velocity of a water molecule (H₂O) in the container if the vapor is at room temperature (23ºC)?

522.7 m/sec412.0 m/sec739.2 m/sec16.5 m/sec

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Question 9 While the temperature of the gas remains at 23ºC, the volume of the container is 0.06 m³. If the surface area of the lid of the container is 0.2 m² then what is the magnitude of the force exerted against the lid by the gas molecules?

2.45 x 10^-23 N6.81 x 10^-23 Nnone of the numerical
values given are correct3.41 x 10^-21 N1.36 x 10^-23 AN