Calculate the equilibrium constant at 298 K for the reaction of ammonia with oxygen to form nitrogen and water. The data refer to 298 K.
4NH3(g) + 3O2(g) 2N2(g) + 6H2O(l)
Substance NH3(g) O2(g) N2(g) H2O(l)
?H°f (kJ/mol) -46 0 0 -285
?G°f (kJ/mol) -16 0 0 -237
S°(J/K·mol) 192 205 192 70