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Question

For gaseous reactions, if ΔH is the change in enthalpy and ΔU that in internal energy, then
ΔH is always greater than ΔU.
If true 1 else 0.
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Solution

The correct option is A 0
As we know,
ΔH=ΔU+ΔnRT
Δn=nPnR
so
ΔU<ΔH only if the number of mole of the reactants is less than that of the products.
ΔH>ΔU only if the number of mole of the products is less than that of the reactants.

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