A process uses the electrolysis of water to produce oxygen and hydrogen.
2H2O(l)→2H2(g)+O2(g)\mathrm{2H_{2}O(l) \rightarrow 2H_{2}(g) + O_{2}(g)}2H2O(l)→2H2(g)+O2(g)
Relative formula masses: H2=2.0\mathrm{H_{2}}=2.0H2=2.0, O2=32.0\mathrm{O_{2}}=32.0O2=32.0
Oxygen is the desired product. Calculate the atom economy of this process.
151 exam-style questions on Edexcel GCSE Chemistry 6.2 Quantitative analysis, covering 6.2.1 Concentration in mol dm⁻³ and titration calculations, 6.2.2 Percentage yield and why actual yield falls short, 6.2.3 Atom economy of a reaction, 6.2.4 Choosing a reaction pathway, and 6.2.5 Molar volume of gases and Avogadro's law. Each one has a worked solution and a mark scheme showing where the marks go.