An off-grid telecommunication tower relies on a hydrogen-oxygen fuel cell for backup power. The total electrical energy required to keep the tower fully operational during a 48-hour power outage is 115.2 megajoules (MJ).
The energy released when 1 mole of hydrogen gas reacts with oxygen in the fuel cell is 288 kJ.
The volume of 1 mole of a gas at room temperature and pressure is 24 dm3\text{dm}^3dm3.
Calculate the volume of hydrogen gas, in dm3\text{dm}^3dm3, at room temperature and pressure needed to run the backup power system for the 48-hour outage.
6 exam-style questions on AQA GCSE Chemistry 5.2 Chemical cells and fuel cells, covering 5.2.1 Cells and batteries and 5.2.2 Fuel cells. Each one has a worked solution and a mark scheme showing where the marks go.