Potassium Sulfide (K2S) K2S1(cr) 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 74.684 115.060 115.060 0. -376.560 -362.745 63.551 300 74.726 115.522 115.061 0.138 -376.573 -362.659 63.145 400 77.320 137.375 118.023 7.741 -384.524 -356.897 46.606 500 79.914 154.907 123.702 15.602 -386.806 -349.730 36.536 600 82.508 169.706 130.167 23.723 -388.349 -342.158 29.787 700 85.144 182.621 136.757 32.105 -389.306 -334.377 24.952 800 87.738 194.161 143.224 40.749 -389.826 -326.490 21.318 900 103.554 205.100 149.486 50.053 -442.745 -317.488 18.427 1000 156.063 218.274 155.672 62.602 -438.078 -303.773 15.867 1050.000 194.982 226.816 158.850 71.364 Cp HUMP MAXIMUM 1050.000 194.985 226.816 158.850 71.364 TRANSITION 1100 142.340 234.558 162.127 79.675 -586.914 -281.577 13.371 1200 142.340 246.943 168.686 93.908 -578.724 -254.180 11.064 1221.000 142.340 249.413 170.053 96.898 CRYSTAL <--> LIQUID 1300 142.340 258.336 175.150 108.142 570.550 227.467 9.140 1400 142.340 268.885 181.473 122.376 -562.393 -201.382 7.514 1500 142.340 278.705 187.632 136.610 -554.251 -175.879 6.125 1600 142.340 287.892 193.614 150.844 -546.127 -150.920 4.927 1700 142.340 296.521 199.416 165.078 -538.021 -126.467 3.886 1800 142.340 304.657 205.039 179.312 -529.933 -102.492 2.974 1900 142.340 312.353 210.486 193.546 -521.866 -78.965 2.171 2000 142.340 319.654 215.764 207.780 -513.823 -55.863 1.459