$\begin{array}{l}
\log {k_c} = \frac{{ - 196860}}{{ - 2.303x8.314x298}}\\
{\rm{Calcualte it we get }}\\
{\rm{log }}{{\rm{k}}_c}{\rm{ = 34}}{\rm{.5014}}\\
{\rm{Take antilog both side we get }}\\
{{\rm{k}}_{\rm{c}}} = 3.192x{10^{34}}
\end{array}$
