Q: If a gas sample is collected over water, which equation should be used to determine the pressure of the dry gas?

$$P_{\text{gas}} = P_{\text{total}} - P$$_{\text{H}$$_2O}$$

Q: Which of the following is the correct formula for the rate of effusion of two gases according to Graham's Law?

$$\dfrac{\text{rate}_1}{\text{rate}_2} = \sqrt{\dfrac{M_2$}{M_1$}}$$

Question 1

Which of the following best describes the relationship between pressure and volume for a gas at constant temperature, according to Boyle's Law?

Accepted Answer

Pressure and volume are inversely proportional.

Question 2

A sample of gas occupies 22.4 L at STP. If the pressure is doubled and the temperature is kept constant, what will be the new volume of the gas?

Accepted Answer

$$11.2\ \mathrm{L}$$

Question 3

Which equation correctly represents the Ideal Gas Law?

Accepted Answer

$$PV = nRT$$

Question 4

A 1.00 L sample of gas is collected at $$25^\circ\mathrm{C}$$ and $$1.25$$ atm. What is the pressure of the gas (in mm Hg) at $$200^\circ\mathrm{C} if $$the volume is $$4.00 L$$?

Accepted Answer

$$95\ \mathrm{mm\ Hg}$$

Question 5

Which statement about diffusion and effusion is correct according to Graham's Law?

Accepted Answer

Lighter gases diffuse and effuse more rapidly than heavier gases.

Question 6

A mixture of gases contains $$0.75$$ mol $$N_2$$, $$0.22$$ mol $$O_2$$, and $$0.60$$ mol $$CO_2. If $$the total pressure of the mixture is $$1.86$$ atm, what is the partial pressure of $$O_2$$?

Accepted Answer

$$0.37\ \mathrm{atm}$$

Question 7

Which of the following is the correct definition of mole fraction ($$x_A) $$for component A in a mixture?

Accepted Answer

$$x_A = \dfrac{n_A}{n_{total}}$$

Question 8

If the density ($$d) of a $$gas is $$0.72\ \mathrm{g/L} at$$ $$90.0^\circ\mathrm{C}$$ and $$380.0\ \mathrm{mm\ Hg}$$, what is the molar mass ($$M) of $$the gas? Use the formula $$M = \dfrac{dRT}{P}.$$

Accepted Answer

$$56.0\ \mathrm{g/mol}$$

Question 9

Which of the following best explains why the pressure inside a barometer is measured in millimeters of mercury ($$\mathrm{mm\ Hg}$$)?

Accepted Answer

The height of the mercury column directly reflects atmospheric pressure.

Question 10

A gas sample has a volume of $$2.5\ \mathrm{L} at$$ $$30^\circ\mathrm{C}$$ and $$720\ \mathrm{Torr}. $$What will be the volume of the gas at $$22^\circ\mathrm{C}$$ and $$760\ \mathrm{Torr}$$?

Accepted Answer

$$2.2\ \mathrm{L}$$

Question 11

Which of the following is true about the total pressure of a mixture of gases according to Dalton's Law?

Accepted Answer

The total pressure is equal to the sum of the partial pressures of each gas.

Question 12

A sealed container with gas at $$2.00$$ atm and $$25^\circ\mathrm{C} is $$heated to $$75^\circ\mathrm{C}. $$What will be the new pressure inside the container?

Accepted Answer

$$2.34\ \mathrm{atm}$$

Question 13

Which of the following is NOT a correct application of the combined gas law?

Accepted Answer

Finding the number of moles of a gas when only pressure and volume are known.

Question 14

Which of the following statements about standard temperature and pressure (STP) is correct?

Accepted Answer

STP is defined as $$0^\circ\mathrm{C}$$ and $$1$$ atm.

Question 15

A gas sample has a density of $$0.800\ \mathrm{g/L} at$$ $$338$$ Torr and $$45^\circ\mathrm{C}. $$What is the molar mass of the gas? (Use $$M = \dfrac{dRT}{P}$$, $$R = 0.08206\ \mathrm{L\ atm\ $$mol^{-1}$$\ K$$^{-1}$$})$$

Accepted Answer

$$22.4\ \mathrm{g/mol}$$

Question 16

Which of the following best describes the effect of increasing temperature on the vapor pressure of a liquid?

Accepted Answer

Vapor pressure increases as temperature increases.

Question 17

If a gas sample is collected over water, which equation should be used to determine the pressure of the dry gas?

Accepted Answer

$$P_{	ext{gas}} = P_{	ext{total}} - P$$_{	ext{H}$$_2O}$$

Question 18

Which of the following is the correct formula for the rate of effusion of two gases according to Graham's Law?

Accepted Answer

$$\dfrac{	ext{rate}_1}{	ext{rate}_2} = \sqrt{\dfrac{M_2$}{M_1$}}$$

Question 19

A gas sample is heated from $$300\ \mathrm{K} to$$ $$600\ \mathrm{K} at $$constant pressure. What happens to the volume of the gas?

Accepted Answer

The volume doubles.

Gases: Properties, Laws, and Calculations – Study Notes for General Biology

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