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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)^(0)-E_(L)^(0)=-1.66V +2.37V`
`E_(cell)=0.71V`
`DeltaG^(0)=-nFE_(cell)^(0)=-6xx96,500xx0.71`
`DeltaG^(0)= -411.09KJ`.
(b) Battery which cannot be reused again are called primary battery.
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