在298K和101.325kPa時,已知下列反應(yīng)C(s)+H2O(g)= CO(g)+H2(g) ΔfHθm/kJ·mol-1 -241.8 -110.5 ΔfGθm/kJ·mol-1 -228.6 -137.2 則ΔfSθm為()J·mol-1·K-1