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Under which of the following condition is the relation `DeltaH = DeltaU +P DeltaV` valid for a closed system at

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Under which of the following condition is the relation `DeltaH = DeltaU +P DeltaV` valid for a closed system at
A. Constant temperature, pressrure , and composition
B. Constant temperature and pressure
C. Constant pressure
D. Constant temperature
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Correct Answer - C
According to thermodynamics,
`H = U + PV`
`:. Delta H = Delta U + Delta (pV)`
`= Delta U + p Delta V + V Delta p + Delta p Delta V`
If `Delta p = 0` (constant pressure), than
`Delta H = Delta U + p Delta V`
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