Thermodynamic Quantities for Selected Substances at 298.15 K (25 C) Substance AHF (kJ/mol) AGF {k}/mol) S (1/K-mol) 0 -748.1 41.4 104.6 200.8 209.2 0 -131.2 222.96 56.5 0 Calcium Ca(s) 0 CaCl2 (s) -795.8 Ca2+ (aq) 226.7 Chlorine Cl2 (g) 0 CI- (aq) -167.2 Oxygen 02 (8) 0 H20 (1) ---285.83 Phosphorus P2 (8) 144.3 PC13 (8) -288.1 POCl3 (8) -5422 Sulfur S(s, rhombic) 0 SO2(g) -269.9 SO3(g) -395.2 205.0 69.91 -237.13 103.7 -269.6 -502.5 218.1 311.7 325 0 -300.4 -370.4 31.88 248.5 256,2 The value of AS for the oxidation of solid elemental sulfur to gaseous sulfur dioxide, S (s, rhombic) + b 218-- 50 268) - is ..J/K . mol. -248.5 +248.5 -11.6 +485,4 +11.6