6. Chemical Quantities & Aqueous Reactions

What is the coefficient for H2O(l) when the reaction PbO2(s) + I2(s) → Pb2+(aq) + IO3−(aq) is balanced in an acidic aqueous solution?

What is the balanced half-reaction for the oxidation occurring at the anode in the galvanic cell: Co(s) | Co2+(aq) || Cu2+(aq) | Cu(s) in an acidic solution?

What is the balanced half-reaction for Al(s) + MnO4^-(aq) -> Al^3+(aq) + Mn^2+(aq) in acidic conditions?