The Standard Free Energy of Formation of Nitric Oxide,NO,at 1000 $\times$

The standard free energy of formation of nitric oxide,NO,at 1000.K (roughly the temperature in an automobile engine during ignition) is 77.9 kJ/mol.Calculate the equilibrium constant for the reaction N₂(g) + O₂(g) 2NO(g)
At 1000.K.

A) 1.56 $\times$ 10⁵
B) 8.53 $\times$ 10^-5
C) -14.7
D) 7.27 $\times$ 10^-9
E) 0.948