1.

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

Answer»

Solution :(a) Apply the relation:
`Delta_(R)G^(@) =-nFE_("cell")^(@)`
Here, n =2, F = 96500 C `mol^(-1)` and `E_("cell")^(@) = 2.71 V`
Substituting the VALUES in the equation, we have
`Delta_(r)G^(@) =-2 XX 96500 C mol^(-1) xx 2.71 V`
`=-523.03 kJ mol^(-1)`
(b) `H_(2) - O_(2)` fuel cell was used in Apollo space programme for providing electrical power.


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