Determine the cell reaction and Ecell for each of the following cells at 25 C. Assume activity and fugacity equal to molar concentration and pressure (bar), respectively. (1) Mg | Mgl(0.1 mol dm) | 1(s) | Pt (i) Ag | AgBr(s) | HBr(0.02 mol dm3) | H,(0.5 bar) | Pt (iii) Fe | Fe(NO3) (0.05 mol dm) | Cu(NO3)(0.01 mol dm) | Cu (iv) Pt | H(g, 0.127 bar) | HCI | H(g, 6.43 bar) | Pt (v) Pt | Hg(1) | HgCl(s) | KC1(0.1 mol dm) | Zn+(0.733 mol dm) | Zn