# Behavior of Gases (College)

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## Behavior of Gases

1.

What is the number of moles of an ideal gas in a 1.75-L container at 290 K and a pressure of 0.650 atm? (R=0.0821 L•atm/mol•K)

- 0.048 mol
- 20.83 mol
- [math] 2.09 xx 10^-3 [/math] mol
- [math] 4.19 xx 10^-4 [/math] mol

2.

What volume will 5.0 mol of Xe occupy at 50ºC and 1.27 atm of pressure? (R=0.0821 L•atm/mol•K)

- 16.2 L
- 104.4 L
- 0.0096 L
- 10.44 L

3.

What is the pressure of a 3.2-mol sample of helium gas that has a volume of 650 mL and that is present at a temperature of 500 K? (R=0.0821 L•atm/mol•K)

- 123705 atm
- 0.202 atm
- 123.71 atm
- 202.1 atm

4.

A 4.0-L sample of a gas is present at 300 K and 1.3 atm. Which of the following conditions would allow this gas to behave more like an ideal gas does?

- 2.0 L and 1.4 atm
- 4.0 L and 200 K
- 1.1 atm and 420 K
- 1.1 atm and 272 K

5.

Ideal gases tend to exhibit which of the following properties?

- Low temperature
- High pressure
- Negligible volume, compared to the distances separating the gas particles from one another
- Inelastic collisions
- Both (a) and (b)

6.

At STP, a gas has a density of 0.900 g/L. A reasonable formula for this gas is

- Ne
- [math]F_2[/math]
- Xe
- [math]CH_4[/math]

7.

A sample of NO has a pressure of 66 mm Hg and a volume of 322 mL. When the NO is transferred to a 1.20-L flask, what is the pressure of the gas?

- 246 mm Hg
- 17.8 mm Hg
- 5855 mm Hg
- 17710 mm Hg

8.

A 1.35-L sample of gas exists at 355 K. When the gas is transferred to a 950-mL container at the same pressure, what is the temperature?

- 236.7 K
- 0.002 K
- 1.88 K
- 236666 K

9.

The particles of an ideal gas have strong attractive forces between them.

- True
- False

10.

In answering the question below, please be sure to include BOTH your work and your answer.

When 3.56 grams of a compound is vaporized at 245ºC and 1.20 atm, the resulting gas occupies a volume of 344 mL. Based on this result, what is the molar mass of the compound? (R=0.0821 L•atm/mol•K)

When 3.56 grams of a compound is vaporized at 245ºC and 1.20 atm, the resulting gas occupies a volume of 344 mL. Based on this result, what is the molar mass of the compound? (R=0.0821 L•atm/mol•K)

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