A company makes magnesium using the reaction shown.
MgCl2→Mg+Cl2\mathrm{MgCl_2 \rightarrow Mg + Cl_2}MgCl2→Mg+Cl2
Magnesium is the desired product.
| Element | Relative atomic mass, ArA_rAr |
|---|---|
| Magnesium | 24 |
| Chlorine | 35.5 |
Both products in the equation are collected and sold.
Calculate the relative formula mass, MrM_rMr, of magnesium chloride, MgCl2\mathrm{MgCl_2}MgCl2.
Use your answer to part (a) and the equation below to calculate the atom economy of this reaction.
atom economy=24Mr of MgCl2×100\text{atom economy} = \dfrac{24}{M_r \text{ of } \mathrm{MgCl_2}} \times 100atom economy=Mr of MgCl224×100
State the percentage of the reactant mass that becomes saleable products.
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.