Hydrogen chloride is made by reacting sodium chloride with sulfuric acid.
2NaCl+H2SO4→Na2SO4+2HCl\mathrm{2NaCl + H_2SO_4 \rightarrow Na_2SO_4 + 2HCl}2NaCl+H2SO4→Na2SO4+2HCl
Hydrogen chloride is the desired product.
| Quantity | Value |
|---|---|
| Mr M_r\,Mr of NaCl\mathrm{NaCl}NaCl | 58.5 |
| Mr M_r\,Mr of H2SO4\mathrm{H_2SO_4}H2SO4 | 98 |
| Mr M_r\,Mr of Na2SO4\mathrm{Na_2SO_4}Na2SO4 | 142 |
| Ar A_r\,Ar of H | 1.0 |
| Ar A_r\,Ar of Cl | 35.5 |
Calculate the percentage atom economy for making hydrogen chloride.
A batch contains a total of 6.45 tonnes6.45\ \text{tonnes}6.45 tonnes of reactants in the ratio shown by the equation. The reaction is complete and no material is lost.
Calculate the mass of sodium sulfate made.
104 exam-style questions on AQA GCSE Chemistry 3.3 Yield and atom economy of chemical reactions, covering 3.3.1a Percentage yield, 3.3.1b Theoretical mass of a product, 3.3.2a Atom economy, and 3.3.2b Choosing a reaction pathway. Each one has a worked solution and a mark scheme showing where the marks go.