Is delta H always greater than delta U? Explain why or why not?

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Solution

ΔH is not always greater than ΔU because
ΔH=ΔU+Δ $n_{g}$ RT
Δ $n_{g}$ may be +ve or -ve
If $n_{p} - n_{r}$ =+ve ( $n_{p}$ : no.of moles of gaseous products and $n_{r}$ : no.of moles of gaseous reactants)
ΔH=ΔU+RT
∴ΔH>ΔU
If $n_{p} - n_{r}$ =−ve
ΔH=ΔU−RT
∴ΔH<ΔU.

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