The table gives approximate data for two car fuels.
| Fuel | Energy released per kg / MJ | Energy released per dm3\mathrm{dm^{3}}dm3 of stored fuel / MJ |
|---|---|---|
| hydrogen (compressed gas) | 142 | 5.6 |
| petrol (liquid) | 46 | 34 |
Statement 1: Per kilogram, hydrogen releases about three times as much energy as petrol.
Statement 2: A hydrogen tank of about 240 dm3240\,\mathrm{dm^{3}}240dm3 is needed to store the same energy as 40 dm340\,\mathrm{dm^{3}}40dm3 of petrol.
Statement 3: Hydrogen is a renewable fuel because the only product when it burns is water.
Which statements are correct?
1 only
2 and 3 only
1 and 3 only
1 and 2 only
130 exam-style questions on Edexcel GCSE Chemistry 9.1 Fuels, covering 9.1.1 Hydrocarbons and crude oil, 9.1.2 Fractional distillation of crude oil and its fractions, 9.1.3 The alkanes as a homologous series, 9.1.4 Complete and incomplete combustion, 9.1.5 Pollutants from burning fuels, 9.1.6 Hydrogen as a fuel and non-renewable fossil fuels, and 9.1.7 Cracking of larger alkanes. Each one has a worked solution and a mark scheme showing where the marks go.