Potassium Sulfide (K2S) K2S1(l) T(K) Cp S -[G-H(Tr)]/T H-H(Tr) delta-f H delta-f G log Kf 0 100 200 250 298.15 74.684 141.172 141.172 0. -346.506 -340.476 59.650 300 74.726 141.634 141.174 0.138 -346.519 -340.439 59.276 400 77.320 163.487 144.136 7.741 -354.470 -337.288 44.045 500 79.914 181.019 149.815 15.602 -356.752 -332.732 34.760 600 82.508 195.819 156.280 23.723 -358.295 -327.771 28.535 700 85.144 208.734 162.869 32.105 -359.252 -322.602 24.073 800 87.738 220.273 169.336 40.749 -359.773 -317.326 20.719 820.010 88.241 222.447 170.606 42.510 GLASS <--> LIQUID 820.010 100.960 222.447 170.606 42.510 TRANSITION 900 100.960 231.844 175.637 50.586 -412.158 -310.970 18.048 1000 100.960 242.481 181.799 60.682 -409.944 -299.847 15.662 1100 100.960 252.103 187.760 70.778 -565.757 -279.720 13.283 1200 100.960 260.888 193.493 80.874 -561.705 -253.895 11.052 1221.000 100.960 262.640 194.667 82.994 CRYSTAL <--> LIQUID 1300 100.960 268.969 198.992 90.970 557.669 228.408 9.178 1400 100.960 276.451 204.261 101.066 -553.649 -203.231 7.583 1500 100.960 283.417 209.309 111.162 -549.646 -178.341 6.210 1600 100.960 289.932 214.146 121.258 -545.660 -153.717 5.018 1700 100.960 296.053 218.786 131.354 -541.691 -129.343 3.974 1800 100.960 301.824 223.241 141.450 -537.742 -105.201 3.053 1900 100.960 307.282 227.521 151.546 -533.813 -81.278 2.234 2000 100.960 312.461 231.640 161.642 -529.907 -57.562 1.503 2100 100.960 317.387 235.607 171.738 -526.026 -34.040 0.847 2200 100.960 322.083 239.432 181.834 -522.174 -10.702 0.254 2300 100.960 326.571 243.124 191.930 -518.353 12.461 -0.283 2400 100.960 330.868 246.691 202.026 -514.569 35.458 -0.772 2500 100.960 334.990 250.141 212.122 -510.825 58.299 -1.218 2600 100.960 338.949 253.481 222.218 -507.125 80.991 -1.627 2700 100.960 342.760 256.717 232.314 -503.476 103.541 -2.003 2800 100.960 346.431 259.856 242.410 -499.882 125.957 -2.350 2900 100.960 349.974 262.903 252.506 -496.350 148.246 -2.670 3000 100.960 353.397 265.863 262.602 -492.887 170.414 -2.967