Q: Which of the following is the correct value and units for the universal gas constant $$R$$ when using pressure in atm and volume in liters?

$$0.0821 \ \text{L} \cdot \text{atm} / (\text{mol} \cdot \text{K})$$

Q: Which of the following equations is used to calculate the root mean square velocity ($$u_{\text{rms}}) of a $$gas molecule?

$$u_{\text{rms}} = \sqrt{\dfrac{3RT}{M}}$$

Question 1

A barometer is used to measure atmospheric pressure. If the atmospheric pressure at sea level is $$760 \ 	ext{mm Hg}$$, what is this pressure in atmospheres (atm)?

Accepted Answer

$$1.00 \ 	ext{atm}$$

Question 2

Which of the following correctly expresses a pressure of $$49 \ 	ext{torr} in $$pascals (Pa)? (Given: $$1 \ 	ext{atm} = 760 \ 	ext{torr} = 101325 \ 	ext{Pa})$$

Accepted Answer

$$6500 \ 	ext{Pa}$$

Question 3

A balloon is squeezed, decreasing its volume. According to Boyle's Law, what happens to the pressure inside the balloon, assuming temperature is constant?

Accepted Answer

The pressure increases.

Question 4

A sample of gas occupies $$2.58 \ 	ext{L} at$$ $$15^\circ 	ext{C}$$ and $$1 \ 	ext{atm}. $$What volume will this gas occupy at $$38^\circ 	ext{C}$$ and $$1 \ 	ext{atm}$$? (Use Charles' Law)

Accepted Answer

$$2.91 \ 	ext{L}$$

Question 5

Which of the following statements 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.

Question 6

A sample of $$0.845 \ 	ext{mol} of$$ $$	ext{N}_2$$ gas occupies a volume of $$23.8 \ 	ext{L} at$$ $$315 \ 	ext{K}$$ and $$0.920 \ 	ext{atm}. $$Which gas law is most appropriate to use to solve for the volume in this scenario?

Accepted Answer

Ideal Gas Law

Question 7

A sample of methane gas with a volume of $$38 \ 	ext{mL} at$$ $$5^\circ 	ext{C} is $$heated to $$86^\circ 	ext{C} at $$constant pressure. What is the new volume? (Use Charles' Law)

Accepted Answer

$$49 \ 	ext{mL}$$

Question 8

Which of the following is the correct form of the Combined Gas Law?

Accepted Answer

$$\dfrac{P_1$ V_1$}{T_1$} = \dfrac{P_2$ V_2$}{T_2$}$$

Question 9

If you double the temperature (in Kelvin) of a fixed amount of gas at constant pressure, what happens to its volume?

Accepted Answer

The volume doubles.

Question 10

A gas sample contains $$0.50 \ 	ext{mol} of$$ $$	ext{O}_2 at$$ $$25^\circ 	ext{C}$$ and $$1 \ 	ext{atm}. If $$all of this $$	ext{O}_2 is $$converted to ozone ($$	ext{O}_3) at $$the same temperature and pressure, what is the volume of the ozone produced? (Assume $$3	ext{O}_2 ightarrow 2	ext{O}_3)$$

Accepted Answer

$$12.2 \ 	ext{L}$$

Question 11

Which of the following is the correct value and units for the universal gas constant $$R$$ when using pressure in atm and volume in liters?

Accepted Answer

$$0.0821 \ 	ext{L} \cdot 	ext{atm} / (	ext{mol} \cdot 	ext{K})$$

Question 12

Which of the following best describes the relationship between temperature and kinetic energy for a gas, according to the Kinetic Molecular Theory?

Accepted Answer

Kinetic energy is directly proportional to temperature.

Question 13

A sample of hydrogen gas occupies $$8.56 \ 	ext{L} at$$ $$0^\circ 	ext{C}$$ and $$1.5 \ 	ext{atm}. $$How many moles of hydrogen are present? (Use $$R = 0.0821 \ 	ext{L} \cdot 	ext{atm} / (	ext{mol} \cdot 	ext{K}))$$

Accepted Answer

$$0.57 \ 	ext{mol}$$

Question 14

Which of the following is NOT an assumption of the Kinetic Molecular Theory (KMT) for ideal gases?

Accepted Answer

Gas particles exert attractive and repulsive forces on each other.

Question 15

Which of the following equations is used to calculate the root mean square velocity ($$u_{	ext{rms}}) of a $$gas molecule?

Accepted Answer

$$u_{	ext{rms}} = \sqrt{\dfrac{3RT}{M}}$$

Question 16

Which of the following best explains why real gases deviate from ideal behavior at high pressures and low temperatures?

Accepted Answer

Intermolecular forces become significant.

Question 17

A gas sample is collected over water at $$25^\circ 	ext{C}$$ and $$1 \ 	ext{atm}$$ total pressure. The vapor pressure of water at $$25^\circ 	ext{C} is$$ $$24 \ 	ext{torr}. $$What is the partial pressure of the dry gas in atm? (Given: $$1 \ 	ext{atm} = 760 \ 	ext{torr})$$

Accepted Answer

$$0.97 \ 	ext{atm}$$

Question 18

Which of the following is the correct rearrangement of the Ideal Gas Law to solve for pressure ($$P$$)?

Accepted Answer

$$P = \dfrac{nRT}{V}$$

Question 19

A mixture of gases contains $$2.0 \ 	ext{mol} of$$ $$	ext{N}_2$$, $$1.0 \ 	ext{mol} of$$ $$	ext{O}_2$$, and $$1.0 \ 	ext{mol} of$$ $$	ext{CO}_2. If $$the total pressure is $$2.0 \ 	ext{atm}$$, what is the partial pressure of $$	ext{O}_2$$?

Accepted Answer

$$0.5 \ 	ext{atm}$$

Question 20

Which of the following best describes the effect of increasing altitude on atmospheric pressure?

Accepted Answer

Atmospheric pressure decreases.

Gas Laws and Atmospheric Pressure: General Chemistry Study Notes

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