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How does enthalpy change with pressure?

Answer 1

Olivia Anton

Pressure has no effect on enthalpy if all other factors stay the same.

#H = U + PV#

For the perfect gas,

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

U is solely dependent on temperature.

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

∴ #ΔH# = 0 + 0 = 0.

There is no change in enthalpy with pressure.

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Answer 2

Cameron Andrews

The enthalpy change with pressure is given by the equation: ( \Delta H = V \cdot \Delta P ), where ( \Delta H ) is the enthalpy change, ( V ) is the volume, and ( \Delta P ) is the pressure change.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.