How does enthalpy change with pressure?

Question

9551 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2014-03-13T17:11:25

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

$H = U + P V$ $H = U + PV$

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.