Zinc sulfate can be made by reacting zinc oxide with sulfuric acid.
ZnO(s)+H2SO4(aq)→ZnSO4(aq)+H2O(l)\mathrm{ZnO(s) + H_{2}SO_{4}(aq) \rightarrow ZnSO_{4}(aq) + H_{2}O(l)}ZnO(s)+H2SO4(aq)→ZnSO4(aq)+H2O(l)
| Substance | Relative formula mass |
|---|---|
| ZnSO4\mathrm{ZnSO_{4}}ZnSO4 | 161 |
| H2O\mathrm{H_{2}O}H2O | 18 |
Zinc sulfate is the desired product in this process.
Calculate the atom economy for zinc sulfate. Express your answer to three significant figures.
atom economy=Mr of the desired productsum of the Mr of all products×100\displaystyle \text{atom economy} = \frac{M_r\text{ of the desired product}}{\text{sum of the }M_r\text{ of all products}} \times 100atom economy=sum of the Mr of all productsMr of the desired product×100
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.