Sodium Sulfide (Na2S2) Na2S2(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 98.625 172.365 172.365 0. -380.114 -381.707 66.873 300 98.726 172.975 172.367 0.183 -380.119 -381.717 66.463 400 104.299 202.140 176.305 10.334 -390.405 -381.587 49.830 500 109.872 226.012 183.928 21.042 -393.756 -379.005 39.594 500.000 109.872 226.012 183.928 21.042 GLASS <--> LIQUID 500.000 124.683 226.012 183.928 21.042 TRANSITION 600 124.683 248.745 192.894 33.511 -394.489 -375.971 32.731 700 124.683 267.965 202.280 45.979 -394.619 -372.868 27.824 753.000 124.683 277.065 207.228 52.587 BETA <--> LIQUID 800 124.683 284.614 211.555 58.447 394.391 369.773 24.144 900 124.683 299.299 220.504 70.916 -500.211 -364.559 21.158 1000 124.683 312.436 229.052 83.384 -497.229 -349.647 18.264 1100 124.683 324.320 237.181 95.852 -494.321 -335.030 15.909 1200 124.683 335.168 244.901 108.321 -685.047 -315.794 13.746 1300 124.683 345.148 252.234 120.789 -680.541 -285.206 11.460 1400 124.683 354.388 259.205 133.257 -676.066 -254.963 9.513 1500 124.683 362.991 265.840 145.726 -671.622 -225.040 7.837