First slide

Standard EMF of a cell

Question

For a cell reaction,
$\large C{u^{2 + }}\left( {{C_1},{\mkern 1mu} {\kern 1pt} aq} \right) + Z{n_{\left( s \right)}}{\mkern 1mu} {\kern 1pt} \to {\mkern 1mu} {\kern 1pt} Z{n^{2 + }}\left( {{C_2},aq} \right) + C{u_{\left( s \right)}}$
of an electrochemical cell, the change in standrad free energy,
$\large \Delta {G^0}\,$
at a given temperature is

Easy

A

$\Delta {G^0}\, = \,RT\ln \frac{{{C_2}}}{{{C_1}}}$
B

$\Delta {G^0}\, = \, - RT\ln \frac{{{C_2}}}{{{C_1}}}$
C

$\Delta {G^0}\, = \,RT\ln {C_2}$
D

$\Delta {G^0}\, = \, - RT\ln {C_2}$

Solution

$\Delta {G^o} = - RT\ln K$

where K = K_cor K_p
$K = \frac{{\left[ P \right]}}{{\left[ R \right]}}$
$\Delta {G^o} = - RT\ln \frac{[P]}{[R]}\;=\;-RTln\frac{C_{2}}{C_{1}}$

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