Table 9. Observed heat capacities of sodium pentaborate pentahydrate (NaB5O8·5H2O).
Gram molecular weight=295.117 g, T deg K=t deg C + 273.15
| Run No. | T a | CP b |
|---|---|---|
| 1 | °K | J deg−1 mole−1 |
| c 83.4065 | 124.37 | |
| 88.6085 | 132.06 | |
| 92.7627 | 137.50 | |
| 97.3204 | 143.41 | |
| 101.6895 | 149.06 | |
| 106.2244 | 154.84 | |
| 110.9289 | 160.82 | |
| 115.4754 | 166.51 | |
| 119.8804 | 172.15 | |
| 124.1608 | 177.35 | |
| 128.3349 | 182.27 | |
| 132.8928 | 187.80 | |
| 137.8308 | 193.69 | |
| 142.8158 | 199.58 | |
| 148.3402 | 206.04 | |
| 154.2458 | 212.94 | |
| 160.0278 | 219.60 | |
| 165.6592 | 226.10 | |
| 2 | ||
| 164.1770 | 224.39 | |
| 169.7858 | 230.82 | |
| 175.2371 | 237.01 | |
| 180.6933 | 242.88 | |
| 186.1680 | 247.49 | |
| 192.8228 | 255.46 | |
| 200.6042 | 263.77 | |
| 208.1534 | 274.86 | |
| 214.8802 | 283.31 | |
| 220.8498 | 290.09 | |
| 226.7036 | 296.50 | |
| 232.5463 | 303.08 | |
| 238.3790 | 309.68 | |
| 243.8250 | 315.73 | |
| 249.1776 | 321.57 | |
| 254.9914 | 327.98 | |
| 260.9762 | 334.45 | |
| 3 | ||
| 247.7110 | 319.95 | |
| 252.7798 | 325.54 | |
| 258.7220 | 331.96 | |
| 264.6066 | 338.25 | |
| 270.4336 | 344.61 | |
| 276.3932 | 350.88 | |
| 282.4880 | 357.31 | |
| 288.4866 | 363.57 | |
| 4 | ||
| 15.8520 | 9.200 | |
| 17.3346 | 11.104 | |
| 18.8288 | 13.302 | |
| 20.2713 | 15.540 | |
| 21.8516 | 18.086 | |
| 23.5410 | 20.907 | |
| 25.4136 | 24.192 | |
| 27.3312 | 27.690 | |
| 29.4477 | 31.546 | |
| 32.0088 | 36.349 | |
| 34.8345 | 41.750 | |
| 38.0104 | 47.805 | |
| 41.5702 | 54.494 | |
| 45.7972 | 62.346 | |
| 50.5750 | 71.141 | |
| 55.3838 | 79.630 | |
| 60.4812 | 88.489 | |
| 66.0802 | 97.873 | |
| 72.4908 | 107.81 | |
| 5 | ||
| 58.5476 | 85.150 | |
| 63.1808 | 93.159 | |
| 68.3146 | 101.42 | |
| 74.2438 | 110.53 | |
| 80.4764 | 119.97 | |
| 85.5548 | 127.70 | |
| 90.3071 | 134.32 | |
| 95.4888 | 141.09 | |
| 6 | ||
| 153.3534 | 211.82 | |
| 159.1856 | 218.60 | |
| 164.8744 | 225.19 | |
| 170.4274 | 231.53 | |
| 7 | ||
| 161.3418 | 220.79 | |
| 167.1078 | 227.40 | |
| 172.5546 | 233.81 | |
| 177.9436 | 239.66 | |
| 183.2148 | 245.70 | |
| 188.3760 | 251.54 | |
| 193.4302 | 258.34 | |
| 198.9778 | 265.70 | |
| 205.5902 | 273.10 | |
| 211.4822 | 279.82 | |
| 216.0996 | 284.99 | |
| 8 | ||
| 278.6015 | 353.16 | |
| 284.7018 | 359.50 | |
| 290.6984 | 365.78 | |
| 296.6560 | 371.93 | |
| 302.6415 | 378.23 | |
| 308.5999 | 384.49 | |
| 312.8014 | 388.84 | |
| 318.6032 | 394.92 | |
| 324.3276 | 401.10 | |
| 330.4356 | 408.02 | |
| 337.3630 | 416.08 | |
| 344.9336 | 444.15 | |
| 9 | ||
| 268.9421 | 342.92 | |
| 270.9374 | 345.18 | |
| 272.9196 | 347.45 | |
| 274.8890 | 349.51 | |
| 276.8471 | 351.36 | |
| 278.7942 | 353.50 | |
| 10 | ||
| 183.5999 | 246.78 | |
| 202.5076 | 269.22 | |
| 221.3134 | 290.69 |
a
T is the mean temperature of the heating interval.
b
CP is the observed mean heat capacity over the interval.
c
The temperatures given are believed to be accurate to 0.01° K. The figures beyond the second decimal are significant only insofar as small temperature differences are concerned.