Chemistry | VITEEE 2016 | Discussion Page

A plot In K against $\frac {1}{T}$ (abscissa) is expected to be a straight line with intercept on ordinate axis equal to

A) $\frac{\triangle S^{0}}{2.303 R}$

B) $\frac{\triangle S^{0}}{ R}$

C) -$\frac{\triangle S^{0}}{ R}$

D) $\triangle S^{0}\times R$

Option B

$RT In K =-\triangle G^{0}=T\triangle S^{0}-\triangle H^{0}$;

$ In K =\frac{\triangle S^{0}}{R}-\frac{\triangle H^{0}}{RT}$

Thus, a plot of In K versus 1/T (abscissa) will be straight line with slope equal to

$\frac{-\triangle H^{0}}{R}$ and intercept $\frac{\triangle S^{0}}{R}$

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