The galvanic cell uses the standard half cells

Question

Mg^2 I Mg and Zn^2 I Zn, and a salt bridge containing KCl(aq). The voltmeter gives a positive voltage reading.

What happens to the size of the electrode in the anode side during the operation of the cell? (no change, increases, or decrease)

What is the voltmeter reading?

Answer 1

Mg -->Mg+2     Eo = +2.37

Zn+2 + 2e- --> Zn  Eo = - 0.763

the Mg anode size decreases,

the voltmeter reading is +1.61