The first law of thermodynamics states that energy can be changed from one form to another but it can neither be created nor destroyed. It conceptualizes the conservation of energy.
The amount of energy added by heating minus the amount lost as a result of the work done by the system on its surroundings is equal to the increase in internal energy.
ΔU = ΔH – ΔW
the work done by gas while expanding,
ΔW = PΔV
=> ΔU = ΔH - PΔV
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