For the reversible reaction, N2(g) + 3H2(g) ⇋ 2NH3(g) at 500°C , the value of Kp is 1.44 x 10-5 when partial pressure is measured in atmospheres. The corresponding value of Kc , with concentration in mole litre-1 , is
(A) 1.44 x 10-5 / (0.082 x 500)-2
(B) 1.44 x 10-5 / (8.314 x 773)-2
(C) 1.44 x 10-5 / (0.082 x 773)2
(D) 1.44 x 10-5 / (0.082 x 773)-2