Question

How does enthalpy vary with pressure? Doesn't it increase at higher pressure?

Answer 1

The solubility of a gas increases with ahigher vapor pressure of gas above the solution. ... This says that the variation in H with pressure at constant temperature isdependent on: The variation in volume due to temperature changes at constantpressure. The volume of the system.

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Answer 2

ΔHvap decreases at higher pressure for a constant temperature. This says that the variation in H with pressure at constant temperature is dependent on: The variation in volume due to temperature changes at constant pressure.