IB Diploma Programme (DP) - SL & HL · Chemistry

Structure 1.5—Ideal gases: Practice Questions

5 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on Structure 1.5—Ideal gases.

10 questions23 marksFree, no account

Question 1

1 mark

Which statement is a valid assumption of the kinetic molecular theory for an ideal gas?

Question 2

1 mark

A container holds $$2.0 \text{ mol}$$ of nitrogen gas and $$3.0 \text{ mol}$$ of oxygen gas at a total pressure of $$5.0 \text{ atm}$$. What is the partial pressure of nitrogen gas?

Question 3

1 mark

When $$10.0 \text{ g}$$ of calcium carbonate ($$CaCO_3$$) reacts completely with excess hydrochloric acid ($$HCl$$), what volume of carbon dioxide gas ($$CO_2$$) is produced at standard temperature and pressure (STP)?

The balanced chemical equation is:
$$CaCO_3(s) + 2HCl(aq) \rightarrow CaCl_2(aq) + H_2O(l) + CO_2(g)$$

(Molar mass of $$CaCO_3 = 100.09 \text{ g mol}^{-1}$$; Molar volume of gas at STP = $$22.4 \text{ L mol}^{-1}$$)

Question 4

1 mark

Which statement best describes an assumption of the ideal gas model?

Question 5

1 mark

A gas sample has a mass of $$2.50 \text{ g}$$ and occupies a volume of $$1.00 \text{ L}$$ at a pressure of $$1.20 \text{ atm}$$ and a temperature of $$25.0 \text{ °C}$$. What is the molar mass of the gas?

(Gas constant R = $$0.0821 \text{ L atm mol}^{-1} \text{ K}^{-1}$$)

Question 6

3 marks

What is the molar volume of an ideal gas at Standard Temperature and Pressure (STP)?

Write your answer out first, then check it against the worked solution.

Question 7

3 marks

Explain why real gases deviate from ideal gas behaviour at very low temperatures.

Write your answer out first, then check it against the worked solution.

Question 8

4 marks

An ideal gas occupies $$2.5 \text{ L}$$ at $$300 \text{ K}$$ and $$1.0 \text{ atm}$$. If the temperature is increased to $$600 \text{ K}$$ and the volume is simultaneously reduced to $$1.25 \text{ L}$$, what will be the new pressure?

Write your answer out first, then check it against the worked solution.

Question 9

3 marks

A sealed container of volume $$12.0 \text{ L}$$ holds a sample of nitrogen gas. The gas is at a temperature of $$30.0 \text{ °C}$$ and exerts a pressure of $$2.50 \text{ atm}$$.

Calculate the number of moles of nitrogen gas present in the container. (Gas constant R = $$0.0821 \text{ L atm mol}^{-1} \text{ K}^{-1}$$)

Write your answer out first, then check it against the worked solution.

Question 10

5 marks

A sample of oxygen gas has a volume of $$15.0 \text{ L}$$ at a pressure of $$1.50 \text{ atm}$$ and a temperature of $$25.0 \text{ °C}$$.

a) Calculate the number of moles of oxygen gas in the sample.

b) If the temperature is increased to $$50.0 \text{ °C}$$ and the pressure is decreased to $$1.00 \text{ atm}$$, what will be the new volume of the oxygen gas, assuming the number of moles remains constant?

(Gas constant R = $$0.0821 \text{ L atm mol}^{-1} \text{ K}^{-1}$$)

Write your answer out first, then check it against the worked solution.

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