Potassium Tetrafluoroborate (KBF4) B1F4K1(cr) T(K) Cp S -[G-H(Tr)]/T H-H(Tr) delta-f H delta-f G log Kf 0 100 200 250 298.15 114.483 133.888 133.888 0. -1886.984 -1784.958 312.717 300 114.780 134.597 133.890 0.212 -1886.963 -1784.325 310.679 400 130.817 169.809 138.583 12.490 -1887.964 -1749.854 228.507 500 146.963 200.734 147.976 26.379 -1885.646 -1715.571 179.224 556.000 156.027 216.808 154.105 34.863 I <--> II 556.000 140.146 242.093 154.105 48.921 TRANSITION 600 142.097 252.840 160.956 55.130 -1868.862 -1682.950 146.514 700 146.519 275.076 175.703 69.561 -1866.685 -1652.134 123.284 800 150.938 294.930 189.387 84.434 -1864.291 -1621.644 105.882 843.000 152.838 302.881 194.975 90.965 II <--> LIQUID 900 155.356 312.963 202.131 99.749 1861.649 1591.469 92.366 1000 159.779 329.560 214.054 115.505 -1858.748 -1561.602 81.570 1100 164.197 344.996 225.264 131.704 -1934.537 -1527.429 72.532 1200 168.619 359.472 235.851 148.345 -1930.056 -1490.614 64.885 1300 173.038 373.143 245.891 165.428 -1925.232 -1454.187 58.430 1400 177.456 386.129 255.448 182.953 -1920.057 -1418.145 52.912 1500 181.878 398.523 264.576 200.919 -1914.526 -1382.485 48.142