A cold store replaces its diesel backup generator with a hydrogen/oxygen fuel cell. The hydrogen is made from natural gas, compressed and delivered to the cold store.
During a power cut, each system would supply the same amount of electrical energy.
| Data | Value |
|---|---|
| Hydrogen used by the fuel cell | 24 kg |
| Carbon dioxide released by producing, compressing and delivering 1 kg of hydrogen | 7.5 kg |
| Carbon dioxide released by the diesel generator | 260 kg |
The company states:
“Using the hydrogen system means that our backup electricity is supplied without releasing carbon dioxide.”
Evaluate the company's claim. Use the information provided and your knowledge of hydrogen/oxygen fuel cells.
131 exam-style questions on OCR GCSE Chemistry 6.2 Organic chemistry, covering 6.2.1 Crude oil and fractional distillation, 6.2.2 Cracking and dependence on hydrocarbons, 6.2.3 Functional groups and homologous series, 6.2.4 Reactions of alkanes, alkenes and alcohols, 6.2.5 Addition polymerisation and repeat units, 6.2.6 Naturally occurring polymers, 6.2.7 Chemical cells and fuel cells, and 6.2.8 Condensation polymerisation and how to make one. Each one has a worked solution and a mark scheme showing where the marks go.