The Standard Free Energy of Formation of N₂(g) at 25°C $\Delta$

The standard free energy of formation of N₂(g) at 25°C is zero. Calculate $\Delta$ G_f (25°C) , in kilojoules per mol, for N₂ at 1000 atm. Assume ideal gas behavior.

A) -17.1 kJ/mol
B) 0 kJ/mol
C) -39.4 kJ/mol
D) +17.1 kJ/mol
E) +39.4 kJ/mol