Sodium Borate (Na2B4O7) B4Na2O7(cr) T(K) Cp S -[G-H(Tr)]/T H-H(Tr) delta-f H delta-f G log Kf 0 0. 0. INFINITE -30.382 -3258.983 -3258.983 INFINITE 100 76.525 50.814 321.976 -27.116 -3268.658 -3208.196 1675.790 200 139.746 124.566 205.130 -16.113 -3274.087 -3145.347 821.480 298.15 186.774 189.490 189.490 0. -3276.741 -3081.522 539.870 300 187.447 190.648 189.494 0.346 -3276.774 -3080.310 536.330 400 213.802 248.460 197.196 20.505 -3283.707 -3014.160 393.609 500 228.534 297.784 212.510 42.637 -3285.408 -2946.574 307.826 600 241.500 340.624 230.368 66.154 -3286.907 -2878.661 250.610 700 252.697 378.715 248.889 90.878 -3288.098 -2810.522 209.724 800 262.128 413.077 267.299 116.622 -3288.983 -2742.233 179.049 900 271.215 444.482 285.266 143.294 -3289.531 -2673.853 155.186 1000 279.700 473.502 302.657 170.845 -3289.721 -2605.430 136.094 1015.600 280.970 477.841 305.314 175.218 CRYSTAL <--> LIQUID 1100 287.583 500.534 319.431 199.214 3289.570 2537.005 120.472 1200 294.863 525.874 335.589 228.342 -3482.640 -2463.728 107.243 1300 301.541 549.743 351.153 258.167 -3480.079 -2378.921 95.586 1400 307.616 572.316 366.152 288.630 -3477.180 -2294.323 85.602 1500 313.089 593.718 380.616 319.653 -3473.995 -2209.943 76.957 1600 320.013 614.144 394.577 351.307 -3470.439 -2125.786 69.400 1700 327.017 633.755 408.074 383.658 -3466.432 -2041.866 62.739 1800 334.105 652.647 421.139 416.714 -3461.958 -1958.196 56.825 1900 341.276 670.903 433.807 450.482 -3457.003 -1874.786 51.541 2000 348.527 688.592 446.106 484.972 -3451.552 -1791.650 46.793