J.3 Hydronium ion, H3O+(g)
\[\dfrac{3}{2}\mathrm{H_2}(g) + \dfrac{1}{2}\mathrm{O_2}(g) \longrightarrow \mathrm{H_3O^+}(g)\]
Data
Enthalpy reference temperature (Tr = 298.15 K); Standard state pressure = p° = 0.1 MPa
- C°p, S°, and -[G°-H°(Tr)]/T in J mol–1 K–1
- ΔH°f and ΔG°f in kJ mol–1
| T (K) | C°p | S° | –[G°-H°(Tr)]/T | H° -H°(Tr) | ΔH°f | ΔG°f | log Kf |
|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | INFINITE | -10.016 | 581.986 | ||
| 100 | 33.258 | 155.526 | 222.432 | -6.691 | |||
| 200 | 33.536 | 178.619 | 195.407 | -3.358 | |||
| 250 | 34.159 | 186.161 | 192.829 | -1.667 | |||
| 298.15 | 35.146 | 192.257 | 192.257 | 0 | 581.158 | 606.607 | -106.275 |
| 300 | 35.19 | 192.474 | 192.257 | 0.065 | 581.154 | 606.765 | -105.647 |
| 350 | 36.54 | 197.997 | 192.691 | 1.857 | 581.074 | 611.04 | -91.193 |
| 400 | 38.081 | 202.975 | 193.67 | 3.722 | 581.045 | 615.324 | -80.353 |
| 450 | 39.697 | 207.554 | 194.961 | 5.667 | 581.08 | 619.607 | -71.922 |
| 500 | 41.309 | 211.82 | 196.436 | 7.692 | 581.18 | 623.883 | -65.177 |
| 600 | 44.368 | 219.626 | 199.663 | 11.978 | 581.571 | 632.391 | -55.055 |
| 700 | 47.158 | 226.678 | 203.026 | 16.556 | 582.194 | 640.815 | -47.818 |
| 800 | 49.727 | 233.145 | 206.392 | 21.402 | 583.021 | 649.135 | -42.384 |
| 900 | 52.131 | 239.142 | 209.702 | 26.496 | 584.029 | 657.341 | -38.151 |
| 1000 | 54.401 | 244.753 | 212.929 | 31.824 | 585.199 | 665.426 | -34.758 |
| 1100 | 56.542 | 250.04 | 216.065 | 37.372 | 586.513 | 673.386 | -31.976 |
| 1200 | 58.553 | 255.047 | 219.107 | 43.128 | 587.955 | 681.221 | -29.653 |
| 1300 | 60.428 | 259.808 | 222.056 | 49.078 | 589.512 | 688.93 | -27.682 |
| 1400 | 62.164 | 264.351 | 224.916 | 55.209 | 591.168 | 696.517 | -25.987 |
| 1500 | 63.763 | 268.695 | 227.691 | 61.506 | 592.911 | 703.981 | -24.515 |
| 1600 | 65.229 | 272.858 | 230.385 | 67.957 | 594.73 | 711.327 | -23.222 |
| 1700 | 66.569 | 276.853 | 233.001 | 74.548 | 596.614 | 718.557 | -22.079 |
| 1800 | 67.79 | 280.693 | 235.545 | 81.267 | 598.552 | 725.674 | -21.059 |
| 1900 | 68.903 | 284.389 | 238.019 | 88.102 | 600.537 | 732.682 | -20.143 |
| 2000 | 69.915 | 287.949 | 240.427 | 95.044 | 602.561 | 739.585 | -19.316 |
| 2100 | 70.837 | 291.383 | 242.772 | 102.082 | 604.618 | 746.386 | -18.565 |
| 2200 | 71.676 | 294.698 | 245.058 | 109.209 | 606.7 | 753.088 | -17.881 |
| 2300 | 72.44 | 297.901 | 247.286 | 116.415 | 608.803 | 759.695 | -17.253 |
| 2400 | 73.138 | 300.999 | 249.46 | 123.694 | 610.923 | 766.21 | -16.676 |
| 2500 | 73.775 | 303.998 | 251.582 | 131.041 | 613.055 | 772.637 | -16.143 |
| 2600 | 74.358 | 306.903 | 253.654 | 138.448 | 615.196 | 778.977 | -15.65 |
| 2700 | 74.891 | 309.719 | 255.678 | 145.911 | 617.343 | 785.236 | -15.191 |
| 2800 | 75.381 | 312.452 | 257.657 | 153.424 | 619.492 | 791.415 | -14.764 |
| 2900 | 75.831 | 315.105 | 259.593 | 160.985 | 621.642 | 797.517 | -14.365 |
| 3000 | 76.245 | 317.683 | 261.486 | 168.589 | 623.79 | 803.545 | -13.991 |
| 3100 | 76.626 | 320.189 | 263.34 | 176.233 | 625.935 | 809.502 | -13.64 |
| 3200 | 76.979 | 322.628 | 265.155 | 183.914 | 628.074 | 815.389 | -13.31 |
| 3300 | 77.304 | 325.001 | 266.932 | 191.628 | 630.207 | 821.21 | -12.999 |
| 3400 | 77.606 | 327.314 | 268.674 | 199.374 | 632.331 | 826.966 | -12.705 |
| 3500 | 77.886 | 329.567 | 270.382 | 207.149 | 634.445 | 832.659 | -12.427 |
| 3600 | 78.146 | 331.765 | 272.057 | 214.95 | 636.548 | 838.293 | -12.163 |
| 3700 | 78.387 | 333.91 | 273.7 | 222.777 | 638.639 | 843.868 | -11.913 |
| 3800 | 78.612 | 336.003 | 275.312 | 230.627 | 640.718 | 849.387 | -11.676 |
| 3900 | 78.823 | 338.048 | 276.894 | 238.499 | 642.782 | 854.852 | -11.449 |
| 4000 | 79.019 | 340.046 | 278.448 | 246.391 | 644.832 | 860.263 | -11.234 |
| 4100 | 79.202 | 342 | 279.975 | 254.302 | 646.866 | 865.624 | -11.028 |
| 4200 | 79.374 | 343.91 | 281.474 | 262.231 | 648.884 | 870.935 | -10.832 |
| 4300 | 79.535 | 345.78 | 282.948 | 270.177 | 650.885 | 876.198 | -10.644 |
| 4400 | 79.687 | 347.61 | 284.397 | 278.138 | 652.869 | 881.415 | -10.464 |
| 4500 | 79.829 | 349.402 | 285.822 | 286.114 | 654.835 | 886.586 | -10.291 |
| 4600 | 79.962 | 351.158 | 287.223 | 294.103 | 656.782 | 891.715 | -10.126 |
| 4700 | 80.088 | 352.88 | 288.602 | 302.106 | 658.712 | 896.801 | -9.967 |
| 4800 | 80.207 | 354.567 | 289.958 | 310.121 | 660.622 | 901.847 | -9.814 |
| 4900 | 80.319 | 356.222 | 291.294 | 318.147 | 662.513 | 906.853 | -9.667 |
| 5000 | 80.425 | 357.846 | 292.609 | 326.185 | 664.386 | 911.821 | -9.526 |
| 5100 | 80.526 | 359.439 | 293.904 | 334.232 | 666.239 | 916.751 | -9.389 |
| 5200 | 80.621 | 361.004 | 295.179 | 342.29 | 668.074 | 921.645 | -9.258 |
| 5300 | 80.71 | 362.54 | 296.435 | 350.356 | 669.89 | 926.504 | -9.131 |
| 5400 | 80.796 | 364.05 | 297.674 | 358.431 | 671.687 | 931.329 | -9.009 |
| 5500 | 80.877 | 365.533 | 298.894 | 366.515 | 673.467 | 936.12 | -8.891 |
| 5600 | 80.953 | 366.991 | 300.097 | 374.607 | 675.228 | 940.881 | -8.776 |
| 5700 | 81.027 | 368.425 | 301.283 | 382.706 | 676.972 | 945.609 | -8.666 |
| 5800 | 81.096 | 369.834 | 302.453 | 390.812 | 678.699 | 950.307 | -8.558 |
| 5900 | 81.162 | 371.221 | 303.607 | 398.925 | 680.41 | 954.974 | -8.455 |
| 6000 | 81.225 | 372.586 | 304.745 | 407.044 | 682.104 | 959.614 | -8.354 |