How does enthalpy change with pressure?

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Answer 1 · 2014-03-13T17:11:25

Enthalpy does not change with pressure if everything else remains constant.

#H = U + PV#

For an ideal gas,

#ΔH = ΔU + Δ(PV) = ΔU + Δ(nRT) = ΔU + nRΔT#

U depends only on the temperature.

If temperature remains constant, #ΔU# = 0 and #ΔT#= 0.

∴ #ΔH# = 0 + 0 = 0.

Enthalpy does not change with pressure.