Table 5. Observed heat capacities of ammonium pentaborate tetrahydrate (NH4B5O8·4H2O).
Gram molecular weight = 272.150 g, T deg K=t deg C + 273.15
| Run No. | T a | CPb |
|---|---|---|
| °K | J deg−1 mole−1 | |
| 1 | c 52.3798 | 82.092 |
| 55.4564 | 87.804 | |
| 59.8250 | 95.826 | |
| 64.6501 | 104.25 | |
| 68.9856 | 111.18 | |
| 73.0430 | 117.29 | |
| 77.3063 | 123.76 | |
| 81.7702 | 130.41 | |
| 2 | 11.4684 | 4.268 |
| 12.2470 | 5.041 | |
| 12.9902 | 5.857 | |
| 13.7754 | 6.831 | |
| 14.6079 | 7.881 | |
| 15.5078 | 9.139 | |
| 16.4598 | 10.516 | |
| 17.5058 | 12.118 | |
| 18.7824 | 14.174 | |
| 20.1809 | 16.554 | |
| 21.5636 | 19.032 | |
| 23.0268 | 21.736 | |
| 24.5876 | 24.749 | |
| 26.2042 | 29.964 | |
| 27.9198 | 31.402 | |
| 29.9899 | 35.709 | |
| 32.1900 | 40.385 | |
| 34.2854 | 43.807 | |
| 36.6468 | 49.984 | |
| 39.7470 | 56.529 | |
| 43.5102 | 64.396 | |
| 47.0718 | 71.681 | |
| 50.7106 | 78.998 | |
| 53.3932 | 84.159 | |
| 56.3964 | 89.765 | |
| 60.7088 | 97.628 | |
| 3 | 79.7048 | 126.60 |
| 83.7367 | 132.96 | |
| 87.8826 | 138.91 | |
| 91.8441 | 144.06 | |
| 95.6642 | 148.85 | |
| 99.3594 | 153.49 | |
| 102.9710 | 157.99 | |
| 106.5092 | 162.33 | |
| 110.2500 | 167.37 | |
| 114.1990 | 171.64 | |
| 118.1925 | 176.34 | |
| 122.2382 | 181.13 | |
| 126.1821 | 185.61 | |
| 4 | 154.0512 | 216.64 |
| 158.8058 | 221.58 | |
| 163.5319 | 226.65 | |
| 168.2332 | 231.54 | |
| 172.8415 | 236.31 | |
| 177.5292 | 241.08 | |
| 182.2946 | 246.17 | |
| 186.9958 | 250.78 | |
| 191.6386 | 255.56 | |
| 5 | 185.3702 | 248.91 |
| 188.8388 | 252.08 | |
| 193.3818 | 257.29 | |
| 198.9176 | 262.78 | |
| 205.4147 | 269.22 | |
| 211.7558 | 275.38 | |
| 218.4874 | 282.04 | |
| 225.5958 | 289.18 | |
| 232.5298 | 295.51 | |
| 239.3223 | 302.38 | |
| 246.0784 | 308.92 | |
| 253.7222 | 316.48 | |
| 260.8091 | 322.92 | |
| 267.2680 | 328.97 | |
| 273.6075 | 335.09 | |
| 279.8340 | 340.69 | |
| 6 | 277.7998 | 338.07 |
| 285.7512 | 345.54 | |
| 293.5821 | 352.74 | |
| 301.2508 | 359.45 | |
| 308.7752 | 366.45 | |
| 316.1723 | 373.00 | |
| 323.4430 | 379.46 | |
| 330.5918 | 385.73 | |
| 337.6318 | 391.78 | |
| 344.9387 | 397.97 | |
| 352.4211 | 404.64 | |
| 359.6954 | 410.85 | |
| 366.8040 | 417.64 | |
| 7 | 127.8625 | 187.44 |
| 134.7264 | 195.30 | |
| 141.6874 | 203.00 | |
| 147.7845 | 209.64 | |
| 153.2160 | 215.54 | |
| 158.4969 | 221.19 |
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.