Q: Which of the following equations correctly relates the density of a gas to its pressure, molar mass, and temperature?

$$d = \dfrac{P \times MW}{RT}$$

Q: Which of the following conversions is correct for standard atmospheric pressure?

$$1$$ \ \text{atm} = 760$$ \ \text{mm Hg} = 101,325$$ \ \text{Pa}$

Question 1

Which of the following statements best explains why gases are more compressible than liquids or solids?

Accepted Answer

Gases have much larger distances between their particles compared to liquids or solids.

Question 2

A barometer is used to measure atmospheric pressure. If the atmospheric pressure supports a column of mercury 760 mm high at $$0^\circC at $$sea level, what is this pressure in pascals (Pa)?

Accepted Answer

$$101,325 Pa$$

Question 3

A closed-tube manometer is used to measure the pressure of a gas sample. If the height difference of mercury is $$250 mm$$, what is the pressure of the gas in torr?

Accepted Answer

$$250$$ \ 	ext{torr}$

Question 4

A sample of gas occupies $$5.00 L at$$ $$2.00$$ atm. If the pressure is decreased to $$1.00$$ atm at constant temperature, what will be the new volume?

Accepted Answer

$$10.0$$ \ 	ext{L}$

Question 5

A gas has a volume of $$3.00 L at$$ $$27^\circC. $$What will its volume be at $$127^\circC$$, assuming constant pressure?

Accepted Answer

$$4.00$$ \ 	ext{L}$

Question 6

Which of the following best describes Avogadro’s Law?

Accepted Answer

At constant temperature and pressure, the volume of a gas is directly proportional to the number of moles of gas.

Question 7

A $$0.250$$ mol sample of gas is at $$1.00$$ atm and $$273 K. $$What is its volume according to the ideal gas law?

Accepted Answer

$$5.60$$ \ 	ext{L}$

Question 8

A tire contains $$0.552$$ mol of gas in an $$8.50 L $$volume at $$32^\circC. $$What is the pressure in atm?

Accepted Answer

$$1.63$$ \ 	ext{atm}$

Question 9

A $$0.133 g $$sample of He gas is placed in a $$648 mL $$container at $$32^\circC. $$What is the pressure in atm? (Molar mass of He = $$4.00 g/$$mol)

Accepted Answer

$$1.25$$ \ 	ext{atm}$

Question 10

A bubble of gas has a volume of $$3.45 mL at a $$depth where the pressure is $$7.6$$ atm and the temperature is $$1.0^\circC. $$What will be its volume at the surface, where the pressure is $$1.0$$ atm and the temperature is $$25^\circC$$?

Accepted Answer

$$28.5$$ \ 	ext{mL}$

Question 11

Which of the following equations correctly relates the density of a gas to its pressure, molar mass, and temperature?

Accepted Answer

$$d = \dfrac{P 	imes MW}{RT}$$

Question 12

A gas has a density of $$1.43 g/L at$$ $$23^\circC $$and $$0.789$$ atm. What is its molar mass?

Accepted Answer

$$44.0$$ \ 	ext{g/mol}$

Question 13

Methanol ($$\mathrm{CH_3OH}) $$can be synthesized by the reaction: $$\mathrm{CO(g) + 2H_2(g) \rightarrow CH_3OH(g)}. $$What volume of $$\mathrm{H_2$}$$ gas at $$355 K $$and $$738 mm Hg is $$required to synthesize $$35.7 g of $$methanol?

Accepted Answer

$$66.9$$ \ 	ext{L}$

Question 14

The combustion of glucose is: $$\mathrm{C_6H_{12}O_6$(aq) + 6O_2(g) \rightarrow 6CO_2(g) + H_2O(l)}. $$Calculate the volume of $$\mathrm{CO_2$}$$ produced at $$37^\circC $$and $$1.00$$ atm when $$10.0 g of $$glucose is consumed.

Accepted Answer

$$8.48$$ \ 	ext{L}$

Question 15

Which of the following is NOT a characteristic property of gases?

Accepted Answer

Gases have strong intermolecular attractions.

Question 16

A gas sample has a mass of $$0.311 g$$, occupies $$0.225 L at$$ $$55^\circC $$and $$886 mm Hg. $$What is its molar mass?

Accepted Answer

$$31.9$$ \ 	ext{g/mol}$

Question 17

Which of the following conversions is correct for standard atmospheric pressure?

Accepted Answer

$$1$$ \ 	ext{atm} = 760$$ \ 	ext{mm Hg} = 101,325$$ \ 	ext{Pa}$

Question 18

Which of the following gases is NOT considered toxic at high concentrations?

Accepted Answer

Argon ($$\mathrm{Ar})$$

Question 19

A $$4.65 L $$sample of He gas contains $$0.225$$ mol of He. How many additional moles of He must be added to obtain a volume of $$6.48 L at $$constant $$T$$ and $$P$$?

Accepted Answer

$$0.089$$ \ 	ext{mol}$

chapter 9 lec 1

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