Which equation shows the reaction occurring in a hydrogen-oxygen fuel cell?
- A$2\mathrm{H}_2 + \mathrm{O}_2 \rightarrow 2\mathrm{H}_2\mathrm{O}$
- B$2\mathrm{H}_2 + 2\mathrm{O} \rightarrow 2\mathrm{H}_2\mathrm{O}$
- C$2\mathrm{H}_2\mathrm{O} \rightarrow 2\mathrm{H}_2 + \mathrm{O}_2$
- D$2\mathrm{H}_2\mathrm{O} \rightarrow 2\mathrm{H}_2 + 2\mathrm{O}$