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Below is a representation of an electrochemical cell.
Pb(s) / `Pb^(2+)` (aq) // `Ag^(+)` (aq)/ Ag(s).
(a) What does // represent?
(b) Given the following:
`Pb^(2+)` (aq) + 2e → Pb (s); - 0.13
`Ag^(2+)` (aq) + e → Ag (s); + 0.80
Calculate the E.M.F. of the electrochemical cell.