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3.2 Use of amount of substance in relation to masses of pure substances

3.2 Use of amount of substance in relation to masses of pure substances

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Question 17

In the industrial production of nitric acid via the Ostwald process, ammonia (NH3\text{NH}_3NH3​) is oxidised over a platinum-rhodium catalyst according to the equation:

4NH3+5O2→4NO+6H2O 4\text{NH}_3 + 5\text{O}_2 \rightarrow 4\text{NO} + 6\text{H}_2\text{O} 4NH3​+5O2​→4NO+6H2​O

Calculate the volume of oxygen gas (O2\text{O}_2O2​) needed to react completely with 6.8 kg6.8\text{ kg}6.8 kg of ammonia.

(Relative atomic masses (ArA_rAr​): H=1\text{H} = 1H=1, N=14\text{N} = 14N=14; the volume of one mole of gas is 24 dm324\text{ dm}^324 dm3.)

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3.2 Use of amount of substance in relation to masses of pure substances Questions

  1. GCSE
  2. /Chemistry
  3. /3.2 Use of amount of substance in relation to masses of pure substances

38 exam-style questions on AQA GCSE Chemistry 3.2 Use of amount of substance in relation to masses of pure substances, covering 3.2.1 Moles (HT only), 3.2.2 Amounts of substances in equations (HT only), 3.2.3 Using moles to balance equations (HT only), 3.2.4 Limiting reactants (HT only), and 3.2.5 Concentration of solutions. Each one has a worked solution and a mark scheme showing where the marks go.

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