The standard Gibbs energy change at 300 K for the reaction $2A \rightleftharpoons B +C$ is $2494.2J$ . At a given time, the composition of the reaction mixture is $[A]= \frac{1}{2}, [B]=2$ and $ [C]=\frac{1}{2}$. The reaction proceeds in the : $[R= 8.314\;J/K/mol,e=2.718]$