For the reaction $A_{\left(g\right)}\to B_{\left(g\right)}$  the value of the equilibrium constant at 300 K and 1 atm is equal to 100.0. The value of ${\Delta }_{r}G$ for the reaction at 300 K and 1 atm in $Jmo{l}^{–1}is –xR$, where x is. (Rounded off to the nearest integer).