Tetraiodosilane (SiI4) I4Si1(cr) T(K) Cp S -[G-H(Tr)]/T H-H(Tr) delta-f H delta-f G log Kf 0 100 200 298.15 108.035 258.153 258.153 0. -189.535 -191.637 33.574 300 108.198 258.822 258.155 0.200 -189.574 -191.650 33.369 393.650 116.388 289.279 262.056 10.716 CRYSTAL <--> LIQUID 400 116.943 291.146 262.503 11.457 223.715 190.911 24.930 500 125.687 318.180 271.003 23.589 -310.254 -174.369 18.216