Enthalpy of solution calculations

The Ostwald solubility coefficient j3, i.e. the ratio of the concentration of the dissolved substance in the solution phase to the concentration of the dissolved substance in the gas phase is, at 297.5 K, 0.201. In the pressure range of 100 to 700 mmHg it is independent of pressure so that, at least below 1 atm, Henry s law is obeyed. With increasing temperature / decreases and reaches a value of 0.137 at 323.2 K. The enthalpy of solution calculated from the temperature dependence of P is -2.95 0.1 kcal/mol 9. 

Relate the volume, enthalpy, and entropy changes of mixing to the relative intermolecular interactions of like (A/) and unlike i-j) interactions. Define the enthalpy of solution. Calculate the enthalpy of mixing from the enthalpy of solution or vice versa. 

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