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The measured e.m.f. at 25^(@)C for the c...

The measured e.m.f. at `25^(@)C` for the cell reaction,
`Zn(s) +Cu^(2+)._((eq))(1.0M) rarr Cu(s) +Zn^(2+)._((aq))(0.1M)` is 1.3 volt, calculate `E^(@)` for the cell reaction.

A

`-176 kJ`

B

`-234.7 kJ`

C

`+123.5 kJ`

D

`-167.26 kJ`

Text Solution

Verified by Experts

The correct Answer is:
D
`DeltaG =- nFE^(@) = DeltaH^(@) - T DeltaS^(@)`
`=-2 F xx 0.695 = DeltaH^(@) - 273 DeltaS^(@)` ...(i)
`=- 2F xx 0.6753 = DeltaH^(@) - 298 DeltaS` ..(ii)
Solve both equation.
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