Lead Borate (PbB6O10) B6O10Pb1(cr) T(K) Cp S -[G-H(Tr)]/T H-H(Tr) delta-f H delta-f G log Kf 0 100 200 250 298.15 230.957 203.342 203.342 0. -4196.552 -3921.603 687.049 300 231.794 204.774 203.347 0.428 -4196.572 -3919.897 682.515 400 286.186 279.058 213.108 26.380 -4196.379 -3827.635 499.838 500 334.218 348.197 233.290 57.454 -4193.800 -3735.697 390.266 600 375.849 412.869 257.889 92.988 -4188.839 -3644.504 317.282 700 413.714 473.741 284.419 132.526 -4186.327 -3553.532 265.168 800 444.466 531.083 311.705 175.503 -4176.749 -3463.763 226.161 900 467.060 584.797 339.098 221.129 -4165.426 -3375.304 195.898 1000 483.629 634.906 366.203 268.703 -4152.890 -3288.176 171.757 1100 495.469 681.590 392.778 317.694 -4139.548 -3202.344 152.067 1200 503.000 725.044 418.678 367.640 -4125.774 -3117.750 135.712 1300 507.812 765.511 443.819 418.199 -4111.850 -3034.313 121.920 1400 510.406 803.246 468.160 469.120 -4097.997 -2951.946 110.138 1500 511.787 838.510 491.688 520.234 -4084.360 -2870.563 99.962 1600 512.707 871.570 514.408 571.459 -4071.001 -2790.081 91.087 1700 513.502 902.678 536.342 622.771 -4057.931 -2710.424 83.281 1800 514.130 932.047 557.517 674.154 -4045.156 -2631.531 76.365 1900 514.590 959.857 577.968 725.591 -4032.686 -2553.337 70.196 2000 514.967 986.262 597.728 777.069 -4020.525 -2475.792 64.661