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Calculate the standard free energy chang...

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`

Text Solution

Verified by Experts

(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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Knowledge Check

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