Question

give the equations for the anode and cathode half-cells in hydrogen/oxygen fuel cell : 2H2(g)+O2(g)>>2H2O (acidic conditions)

Answer 1

Anode (negative) side:
2H2 (g) gives 4H+(aq) + 4e-(aq)

Cathode (positive) side:
O2 (g) + 4H+(aq) + 4e-(aq) gives 2H2O(l)

Net reaction:
2H2 (g)+ O2 (g) 2H2O (l)