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Establish a relationship between DeltaH ...

Establish a relationship between `DeltaH and DeltaU`. Under what conditions is `DeltaH = DeltaU` ?

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`DeltaH =DeltaE + DeltanRT` or `DeltaH = DeltaH + DeltanRT`
`DeltaH=DeltaU` when `Deltan=0` or `DeltaV=0`
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