Consider the following reversible reaction, `AgB g rarr ABg` . The activation energy of the backward reaction exceeds that of the forward reaction by 2` (in J mol^(1))`. If the pre-exponential factor of the forward reaction is 4 times that of the reverse reaction, the absolute value of`triangle G^(theta) (in J mol^(−1))` for the reaction at 300 K is ____. (Given, ln(2) = `0.7, = 2500 J mol^(−1)` at 300 K and G is the Gibbs energy)