Answer:
The reaction is:
\[\underset{\begin{smallmatrix}
t=0 \\
{{t}_{eq}}
\end{smallmatrix}}{\overset{{}}{\mathop{{}}}}\,\,\,\underset{\begin{smallmatrix}
0.78 \\
(0.78-2x)
\end{smallmatrix}}{\mathop{2ICl(g)}}\,\rightleftharpoons
\underset{\begin{smallmatrix}
0 \\
x
\end{smallmatrix}}{\mathop{{{I}_{2}}(g)}}\,+\underset{\begin{smallmatrix}
0 \\
x
\end{smallmatrix}}{\mathop{C{{l}_{2}}(g)}}\,\]
\[{{K}_{C}}=\frac{[{{I}_{2}}][C{{l}_{2}}]}{{{[ICl]}^{2}}}\]
\[0:14=\frac{x\times x}{{{(0.78-2x)}^{2}}}\]
\[\sqrt{0.14}=\frac{x}{{{(0.78-2x)}^{2}}}\]
\[0.374=\frac{x}{0.78-2x}\]
\[x=0.167\]
\[[{{I}_{2}}]=[C{{l}_{2}}]=0.167M\]
\[[ICl]=0.78-2\times
0.167\]
\[=0.446M\]
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