Equilibrium: JEE Main 2015 Chemistry question

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