The gaseous state: ideal and real gases and pV = nRT: past paper questions

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• Question 8May/June 2026, paper 12Multiple choice1 mark

  In this question, you should assume that nitrogen behaves as an ideal gas. What is the volume of $15.0\text{ g}$ of nitrogen at a temperature of $70.0{}^{\circ }\text{C}$ and a pressure of $192\text{ kPa}$?

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• Question 11Oct/Nov 2025, paper 11Multiple choice1 mark

  $1.00\text{ g}$ of nitrogen gas is stored in a $2.00{\text{ dm}}^3$ vessel at $40.0{}^{\circ }\text{C}$. What is the pressure in the vessel?

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• Question 7Oct/Nov 2024, paper 12Multiple choice1 mark

  In this question you may assume that nitrogen behaves as an ideal gas. One atmosphere pressure $=101\text{ kPa}$. Which volume does $1.0\text{ g}$ of nitrogen occupy at ${50}^{\circ }\text{C}$ and a pressure of $2.0\text{ atmospheres}$?

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• Question 7Oct/Nov 2023, paper 11Multiple choice1 mark

  When an evacuated tube of volume $400{\text{ cm}}^3$ is filled with gas at $300\text{ K}$ and $101\text{ kPa}$, the mass of the tube increases by $0.65\text{ g}$. Assume the gas behaves as an ideal gas. What is the identity of the gas?

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• Question 7May/June 2026, paper 13Multiple choice1 markHas a diagram

  In the ideal gas equation $pV=nRT$, what do the symbols $n$ and $T$ represent?

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• Question 7May/June 2024, paper 11Multiple choice1 mark

  What is the density of a sample of fluorine gas at $32{}^{\circ }\text{C}$ and $100000\text{ Pa}$?

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• Question 9Oct/Nov 2023, paper 12Multiple choice1 mark

  At a temperature of $2500\text{ K}$ and a pressure of $1.00\times {10}^{-4}\text{ Pa}$, a sample of $0.321\text{ g}$ of sulfur vapour has a volume of $2.08\times {10}^6{\text{ m}}^3$. What is the molecular formula of sulfur under these conditions?

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• Question 2May/June 2026, paper 21Structured9 marks

  The Contact process uses sulfur to produce sulfuric acid. stage 1 Sulfur is burned in excess air.

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• Question 7May/June 2024, paper 12Multiple choice1 mark

  In this question it should be assumed that nitrogen behaves as an ideal gas under the conditions stated. Which volume is occupied by $1.00\text{ g}$ of nitrogen at $50.0{}^{\circ }\text{C}$ and at a pressure of $120\text{ kPa}$?

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• Question 2May/June 2026, paper 23Structured9 marks

  Group 18 elements exist as colourless gases at room temperature and pressure.

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• Question 13May/June 2025, paper 11Multiple choice1 markHas a diagram

  The diagram shows two containers of methane connected by a closed tap. Each container has a volume of $1.00{\text{ m}}^3$. The tap is opened.

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• Question 26May/June 2024, paper 12Multiple choice1 mark

  Z is a gaseous hydrocarbon which has a density of $3.50\times {10}^{-3}\text{ g}{\text{cm}}^{-3}$ under room conditions. Z reacts with an excess of hot concentrated acidified ${\text{KMnO}}_4$. Only one type of carboxylic acid is formed in this reaction.

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• Question 7May/June 2024, paper 13Multiple choice1 markHas a diagram

  The diagram shows the apparatus used to find the relative molecular mass of a volatile liquid.

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• Question 3Oct/Nov 2023, paper 21Structured12 marksHas a diagram

  Potassium chlorate, $\mathrm{K}\mathrm{C}\mathrm{l}{\mathrm{O}}_3$, is widely used as an oxidising agent and to make ${\mathrm{O}}_2(\mathrm{g})$. Define oxidising agent.

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• Question 14May/June 2025, paper 13Multiple choice1 mark

  When $0.15\text{g}$ of an organic compound is vaporised, it occupies a volume of $65.0{\text{cm}}^3$ at $405\text{K}$ and $1.00\times {10}^5\text{Pa}$.

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• Question 13May/June 2023, paper 11Multiple choice1 mark

  In this question you should assume that the gas formed behaves as an ideal gas.

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• Question 8May/June 2023, paper 12Multiple choice1 mark

  The volume of a vessel is $1.20\times {10}^{-3}{\text{ m}}^3$. It contains pure argon at a pressure of $1.00\times {10}^5\text{ Pa}$, and at a temperature of $25.0{}^{\circ }\text{C}$. Under these conditions it can be assumed that argon behaves as an ideal gas.

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• Question 7May/June 2023, paper 13Multiple choice1 mark

  Which assumptions are made about ideal gases?

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