It seems that in some cases it's the same (that is, ΔQp=ΔH) yet in others they differ. For example, 2HX2(g)+OX2(g)⟶2HX2O(l)ΔH=−572 kJ
The answer for one mole of HX2O produced is −572×0.5 kJ. Is this under the assumption of constant pressure? Therefore it's ΔQp=ΔH?
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