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For gaseous reactions, if DeltaH is the ...

For gaseous reactions, if `DeltaH` is the change in enthalpy and `DeltaU` that in internal energy then:

A

`DeltaH` is always greater than `DeltaU`

B

`DeltaH` is always less than `DeltaU`

C

`DeltaH lt DeltaU` only if the number of mole of the gaseous products is less than that of the gaseous reactants

D

`DeltaU lt DeltaH` only if the number of mole of the gaseous reactants is less than that number of the gaseous products

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C, D
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