When sodium hydrogencarbonate is heated, it decomposes as shown.
2NaHCO3→Na2CO3+H2O+CO2 2\mathrm{NaHCO_{3}} \rightarrow \mathrm{Na_{2}CO_{3}} + \mathrm{H_{2}O} + \mathrm{CO_{2}} 2NaHCO3→Na2CO3+H2O+CO2Sodium carbonate is the desired product.
| Substance | MrM_rMr |
|---|---|
| Na2CO3\mathrm{Na_{2}CO_{3}}Na2CO3 | 106.0 |
| H2O\mathrm{H_{2}O}H2O | 18.0 |
| CO2\mathrm{CO_{2}}CO2 | 44.0 |
Calculate the atom economy of this reaction.
Use the equation: atom economy = (Mr M_r\,Mr of desired product ÷ total Mr M_r\,Mr of all products) × 100
Atom economy = ...... %
152 exam-style questions on OCR GCSE Chemistry 5.1 Monitoring chemical reactions, covering 5.1.1 The technique of titration, 5.1.2 Theoretical mass, percentage yield and atom economy, 5.1.3 Concentration of a solution in mol/dm3, 5.1.4 Concentration calculations and titration results, 5.1.5 Molar gas volume and volumes of gases in reactions, and 5.1.6 Choosing a reaction pathway. Each one has a worked solution and a mark scheme showing where the marks go.