Question

From the following cell-reaction ; $2A{g}^{+}+Cu\to C{u}^{2+}+2Ag$, temperature coeficient is $2\times {10}^{-3}V/K$. Hence, entropy change is:

• A. -3.86 J/K
• B. 3.86 J/K
• C. -386 J/K
• D. 386 J/K

Answer 1

Answer: (D)

386 J/K

The relationship betwen temperature coefficient and entropy change is $\Delta S=nF{\left(\frac{dE}{dT}\right)}_P$.

Substitute values in the above expression.

$\Delta S=2\times 96500\times (2\times {10}^{-3})=386\frac{J}{K}.$

Option D is correct.