Question

$\Delta G^o$ for the reaction, $A{g}^{+}\left(aq\right)+\frac{1}{2}{H}_2\left(g\right)\to H^{+}\left(aq\right)+Ag\left(s\right)$, where standard potential for silver half cell reaction is $0.8V$, will be:

• A. $-77.2kJ$
• B. $+77.2kJ$
• C. $+154.4kJ$
• D. $-36.6kJ$

Answer 1

The correct option is A $-77.2kJ$

${Ag}^{+}\left(aq\right)+\frac{1}{2}{H}_2\left(g\right)⟶H^{+}\left(aq\right)+Ag\left(s\right)$

$n=1$, Given $E=0.8V$

We know $\Delta G=-nEF$

$=-1\times 0.8\times 96500$

$=-77200$

$=-77.2kJ$