Half and Full Reactions

Question

Write the half-reactions and full cell reaction for the following cell:

Mg(s)∣∣Mg+2(aq)∣∣∣∣Al+3(aq)∣∣Al(s)

Answer 1

Mg(s) ==> Mg²⁺ + 2e-(aq) ... oxidation half reaction [x3]

Al³⁺(aq) + 3e- ==> Al(s) ... reduction half reaction [x2]

3Mg(s) + 2Al³⁺(aq) ==> 3Mg²⁺(aq) + 2Al(s) ... full cell reaction