ENTHALPIES OF SOLUTION OF GASES IN LIQUIDS - CALORIMETER AND MEASUREMENTS ON LOWER HYDROCARBONS AND CO2 IN C6H6, CCL4, AND THF

An isothermal gas solution calorimeter which yields results under conditions approaching constant volume and temperature is described. Enthalpies of solution of methane, ethane, ethylene, propane, and carbon dioxide in benzene, carbon tetrachloride, and tetrahydrofuran have been determined. Assignments of ΔHo are reported at 288.15 and 298.15 K. The relative precision of the measurements ranged from an optimum of about 1.5 per cent when ΔHo was around 25 kJ mol-1 to 15 per cent when ΔHo was in the 3 to 4 kJ mol-1 range. Comparison of literature data of the redetermined enthalpy of solution of CO2 in 0.1 mol dm-3 aqueous NaOH (ΔHo approximately 110 kJ mol-1) indicated that the accuracy was in the 1 to 2 per cent range. The enthalpy of solution of CO2 in 0.1 mol dm-3 NaOD was measured as (114.6 ± 1.0) kJ mol-1. © 1979.