(b) The value of ΔGfo for Fe(g) is 370.7 kJ mol-1 at 298.15 K, and ΔHfo for Fe(g) is 416.3 kJmol-1 at the same temperature. Assuming that ΔHfo is constant in the interval 250 – 400 K,calculate ΔGfo for Fe(g) at 400 K. (5%)