1.

Calculate the standard free energy change for the following reaction occurring in the galvanic cell at 298 K. 3Mg(s)+2Al^(3+)(aq)rarr3Mg^(2+)(aq)+2Al(s) Given : E_(Mg^(2+)//Mg)^@=-2.37V and E_(Al^(3+)//Al)=-1.66 V

Answer»

Solution :(a) `E_(cell)=E_R^@-E_L^@`
`=-1.66+2.37`
=0.71 V
`Delta G^@=-nFE^@ cell`
`=-3 times 96500 times 0.71`
`=-41090 J Or -411.09 K J`
(b) BATTERY cannot be reused.


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