Nitrogen Oxide (N2O4) N2O4(l) T(K) Cp S -[G-H(Tr)]/T H-H(Tr) delta-f H delta-f G log Kf 0 100 112.884 72.843 325.324 -25.248 -27.487 15.871 -8.290 200 127.528 155.582 221.720 -13.227 -24.199 58.075 -15.168 261.950 136.843 191.160 210.426 -5.047 CRYSTAL <--> LIQUID 298.15 142.509 209.198 209.198 0. 19.564 97.521 17.085 300 142.842 210.081 209.201 0.264 -19.463 98.247 -17.106 400 160.833 253.638 215.019 15.448 -13.139 136.576 -17.835 500 178.824 291.459 226.598 32.431 -5.213 173.120 -18.086