(a) Calculate `Delta_(r)G^(@)` for the reaction `Mg(s)+Cu^(2)(aq)rarrMg^(2+)(aq)+Cu(s)`
Given : `E^(@)cell=+2.71 V,1F=96500 C mol^(-1)`
(b) Name the type of cell which was used Apollo space programme for providing electrical power

Explanation

(a) `Delta_(r)G^(@)=-n FE^(@)`
=`-2xx96500xx2.71=-523030=-523.03 kJ`
(b) Fuel cell Electyrolyte NaOH/KOH
`H_(2)` high Pr high Pr.
Porous carbon or graphite electrodes impregnated with black Pt particles
In fuel cell porous carbon electrodes impregnated with Pt particles are used Ex `H_(2)^(-)O_(2)`