An airport is choosing a power source for 12 vehicles used to carry luggage.
Each vehicle works for 7 hours and is then unused for 5 hours. The power system is included in the maximum permitted mass of each vehicle, so a lower power-system mass allows more luggage to be carried.
The airport collected the following data.
| Data | Hydrogen fuel cell | Rechargeable battery |
|---|---|---|
| Working time from a full tank or full charge in hours | 10 | 8 |
| Time needed for refuelling or recharging in hours | 0.2 | 4.0 |
| Mass of power system per vehicle in kg | 180 | 500 |
| Annual carbon dioxide emissions from producing the hydrogen or generating the charging electricity in tonnes | 72 | 24 |
| Setup cost for 12 vehicles | £600 000 | £140 000 |
Evaluate which power source the airport should choose for its luggage vehicles.
90 exam-style questions on AQA GCSE Chemistry 5.2 Chemical cells and fuel cells, covering 5.2.1 Cells and batteries, 5.2.2a Fuel cells, and 5.2.2b Half equations for hydrogen fuel cells. Each one has a worked solution and a mark scheme showing where the marks go.