Ammonium Iodide (NH4I) H4I1N1(cr) T(K) Cp S -[G-H(Tr)]/T H-H(Tr) delta-f H delta-f G log Kf 0 100 200 298.15 81.755 112.968 112.968 0. -202.087 -111.966 19.616 300 81.881 113.474 112.970 0.151 -202.120 -111.407 19.398 400 88.998 138.004 116.266 8.695 -211.666 -80.646 10.531 500 96.148 158.632 122.727 17.953 -233.822 -45.736 4.778 600 103.261 176.789 130.252 27.922 -233.079 -8.177 0.712 700 110.458 193.247 138.093 38.608 -231.674 29.204 -2.179 800 117.696 208.468 145.949 50.015 -229.616 66.340 -4.332 900 124.976 222.753 153.697 62.150 -226.914 103.179 -5.988 1000 132.089 236.288 161.285 75.003 -223.590 139.683 -7.296 1100 139.327 249.217 168.695 88.574 -219.652 175.825 -8.349 1200 146.440 261.656 175.927 102.875 -215.099 211.581 -9.210 1300 152.030 273.609 182.984 117.812 -210.029 246.935 -9.922 1400 156.098 285.034 189.869 133.231 -204.598 281.884 -10.517 1500 158.643 295.899 196.579 148.980 -198.962 316.437 -11.019 1600 159.666 306.178 203.110 164.909 -193.275 350.611 -11.446 1700 159.166 315.851 209.461 180.863 -187.688 384.432 -11.812 1800 157.144 324.898 215.626 196.691 -182.352 417.931 -12.128 1900 153.599 333.307 221.601 212.241 -177.418 451.143 -12.403 2000 148.532 341.063 227.383 227.360 -173.034 484.109 -12.644