An outdoor pursuits instructor is testing the efficiency of different camping stove fuels. They used a portable burner to heat 450 cm3 of water by 40∘C40^\circ\text{C}40∘C for each liquid alkane fuel.
Table 1 shows some of their measurements.
Table 1
| Alkane fuel | Initial mass of burner and fuel (g) | Final mass of burner and fuel (g) | Mass of alkane burned (g) |
|---|---|---|---|
| Propane | 345.85 | 344.20 | 1.65 |
| Butane | 350.12 | 348.67 | |
| Pentane | 362.40 | 361.05 | 1.35 |
| Hexane | 374.95 | 373.83 | 1.12 |
Calculate the mass of butane burned.
94 exam-style questions on Edexcel GCSE Chemistry 8.2 Heat energy changes in chemical reactions, covering 8.2.1 Exothermic and endothermic changes, 8.2.2 Bond breaking, bond making and overall energy change, 8.2.3 Calculating energy change from bond energies, and 8.2.4 Activation energy and reaction profiles. Each one has a worked solution and a mark scheme showing where the marks go.