Abstract
The isothermal displacement
calorimeter initially described by Stokes, Marsh and Tomlins
has been modified to allow the measurement of the enthalpy of solution of
gases. This paper reports the enthalpy of solution of argon and nitrogen in
tetrachloromethane, cyclohexane, and benzene at 298.15 K and the enthalpy of
solution of carbon dioxide, methane, ethane, ethene, and propane in the above
three solvents at 298.15 and 318.15 K. Comparisons are made with other direct
measurements and with results derived from the variation of gas solubility with
temperature. The apparatus appears to have a higher precision than those
described previously. For carbon dioxide and the hydrocarbon gases the
precision is of the order of �0.2 kJ mol-1, while for argon and
nitrogen the precision is of the order of �0.5 kJ mol-1.
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