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Question

Under which of the following conditions is the relation, Δ H = Δ U + PΔ V valid for a closed system?



Your Answer
A

Constant pressure

Your Answer
B

Constant temperature

Correct Answer
C

Constant temperature and pressure

Your Answer
D

Constant temperature, pressure and composition


Solution

The correct option is D

Constant temperature and pressure


We know that H = U + PV

Δ H = Δ U + Δ PV

Δ H = ΔU+PΔV+VΔP

At constant pressure

Δ H = Δ U + PΔV

But PΔV = Δng RT

Δ H = Δ U + Δng RT

At constant temperature

At constant pressure & temperature

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