Which equation represents the half-reaction occurring at the anode of an alkaline hydrogen-oxygen fuel cell?
O2(g)+2H2O(l)+4e−→4OH−(aq)\text{O}_2\text{(g)} + 2\text{H}_2\text{O(l)} + 4\text{e}^- \rightarrow 4\text{OH}^-\text{(aq)}O2(g)+2H2O(l)+4e−→4OH−(aq)
H2(g)→2H+(aq)+2e−\text{H}_2\text{(g)} \rightarrow 2\text{H}^+\text{(aq)} + 2\text{e}^-H2(g)→2H+(aq)+2e−
H2(g)+2OH−(aq)→2H2O(l)+2e−\text{H}_2\text{(g)} + 2\text{OH}^-\text{(aq)} \rightarrow 2\text{H}_2\text{O(l)} + 2\text{e}^-H2(g)+2OH−(aq)→2H2O(l)+2e−
2H2(g)+O2(g)→2H2O(l)2\text{H}_2\text{(g)} + \text{O}_2\text{(g)} \rightarrow 2\text{H}_2\text{O(l)}2H2(g)+O2(g)→2H2O(l)