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Question

Under which of the following conditions is the relation,
ΔH=ΔU+PΔV
valid for a closed system.

A
At constant pressure
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B
At constant volume
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C
At constant temperature
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D
At constant volume and pressure
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Solution

The correct option is A At constant pressure
We know enthalpy change is given as:
ΔH=ΔU+Δ(PV)
ΔH=ΔU+PΔV+VΔP
At constant pressure,
ΔP=0,
so, ΔH=ΔU+PΔV

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