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If DeltaH is the change in enthylpy and ...

If `DeltaH` is the change in enthylpy and `DeltaU`, the change in internal energy accompanying a gaseous reactant then

A

`DeltaH` is always greater than `DeltaU`

B

`DeltaHlt DeltaU` only if the number of moles of the products is greater than the number of the reactants

C

`DeltaH "is always less than " Delta U`

D

`DeltaHlt DeltaU` only if the number of moles of the products is less than the number of moles of the reactants

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The correct Answer is:
D
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If Delta H is the change in enthalpy and Delta U the change in internal energy accompanying a gaseous reaction (A) Delta H is always greater than Delta U (B) Delta H < Delta U only if the number of moles of the products is greater than the number of the reactants (C) Delta H is always less than Delta U (D) Delta H < Delta U only if the number of moles of the products is less than the number of the reactants

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TARGET PUBLICATION-CHEMICAL THERMODYNAMICS AND ENERGETICS -COMPETITIVE THINKING
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