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3.3 Yield and atom economy of chemical reactions

3.3 Yield and atom economy of chemical reactions

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Question 2

Tungsten can be produced from tungsten(VI) oxide by reduction with hydrogen gas.

The equation for the reaction is:

WO3+3H2→W+3H2O WO_3 + 3H_2 \rightarrow W + 3H_2O WO3​+3H2​→W+3H2​O

Calculate the percentage atom economy for the production of tungsten from tungsten(VI) oxide. Give your answer to 3 significant figures.

Use the equation:

Percentage atom economy=Total relative formula mass of desired productTotal relative formula mass of all reactants×100 \text{Percentage atom economy} = \frac{\text{Total relative formula mass of desired product}}{\text{Total relative formula mass of all reactants}} \times 100 Percentage atom economy=Total relative formula mass of all reactantsTotal relative formula mass of desired product​×100

Relative atomic masses (ArA_rAr​):

  • W=184W = 184W=184
  • O=16O = 16O=16
  • H=1H = 1H=1
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Markscheme

3.3 Yield and atom economy of chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /3.3 Yield and atom economy of chemical reactions

31 exam-style questions on AQA GCSE Chemistry 3.3 Yield and atom economy of chemical reactions, covering 3.3.1 Percentage yield and 3.3.2 Atom economy. Each one has a worked solution and a mark scheme showing where the marks go.

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