$$0.24 \times 22.71 = 5.45\ \mathrm{L}$$

$$V_2$$ = $$V_1$$ \dfrac{$$T_2$$}{$$T_1$$} = 25 \times \dfrac{331}{298} = 27.7\ \mathrm{mL}$$

$$0.5 \times 22.71 = 11.36\ \mathrm{L}$$

Question 1

Which of the following best describes Avogadro's Law?

Accepted Answer

At constant temperature and pressure, equal volumes of different gases contain equal numbers of molecules.

Question 2

A sample of nitrogen gas contains 0.24 mol at STP. What volume does it occupy?

Accepted Answer

$$0.24 	imes 22.71 = 5.45\ \mathrm{L}$$

Question 3

Which equation is used to calculate the number of moles of a gas at STP given its volume?

Accepted Answer

$$n = \dfrac{V}{22.71}$$

Question 4

A reaction produces 4.39 L of hydrogen gas at STP. How many moles of hydrogen are formed?

Accepted Answer

$$n = \dfrac{4.39}{22.71} = 0.193\ \mathrm{mol}$$

Question 5

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

Accepted Answer

$$PV = nRT$$

Question 6

If the pressure on a gas is doubled at constant temperature, what happens to its volume according to Boyle's Law?

Accepted Answer

The volume is halved.

Question 7

A gas occupies 25 mL at 25°C. What volume will it occupy at 58°C, assuming pressure is constant?

Accepted Answer

$$V_2$$ = $$V_1$$ \dfrac{$$T_2$$}{$$T_1$$} = 25 	imes \dfrac{331}{298} = 27.7\ \mathrm{mL}$$

Question 8

Which value is closest to Avogadro's number?

Accepted Answer

$$6.022 	imes 10$$^{23}$$

Question 9

Which of the following statements is true about the molar volume of a gas at STP?

Accepted Answer

All gases occupy $$22.71\ \mathrm{L}$$ per mole at STP.

Question 10

A balloon contains 1 mole of neon and 1 mole of nitrogen at STP. Which statement is correct?

Accepted Answer

Both balloons have the same volume but different masses.

Question 11

Which of the following is the correct expression for Boyle's Law?

Accepted Answer

$$P_1$$ $$V_1$$ = $$P_2$$ $$V_2$$

Question 12

Which variable must be in Kelvin when using the Ideal Gas Law?

Accepted Answer

Temperature ($$T)$$

Question 13

A gas sample is collected at 58°C. What is the temperature in Kelvin?

Accepted Answer

$$58 + 273 = 331\ \mathrm{K}$$

Question 14

Which constant is used in the Ideal Gas Law and what are its units?

Accepted Answer

$$R = 8.314\ \mathrm{J}\ \mathrm{K}^{-1}\ \mathrm{mol}^{-1}$$

Question 15

If the volume of a gas in a syringe is doubled while temperature and pressure are constant, what happens to the number of moles of gas?

Accepted Answer

The number of moles doubles.

Question 16

Which of the following is NOT a requirement for using the molar volume relationship $$n = V/22.71$$?

Accepted Answer

The gas can be at any temperature and pressure.

Question 17

A student collects 0.5 mol of oxygen gas at STP. What volume will the gas occupy?

Accepted Answer

$$0.5 	imes 22.71 = 11.36\ \mathrm{L}$$

Question 18

Which of the following is a real-world application of Avogadro's Law?

Accepted Answer

Inflating a car tire with different gases results in the same pressure if the number of moles and conditions are the same.

Question 19

A sealed container has a fixed amount of gas. If the temperature increases at constant pressure, what happens to the volume?

Accepted Answer

The volume increases.

Question 20

Which of the following is the correct rearrangement of the Ideal Gas Law to solve for pressure?

Accepted Answer

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

Gas Laws and the Mole: Fundamental Concepts in Chemistry

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