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Enthalpy is the amount of heat absorbed or released by a system under constant pressure, which essentially is the heat at constant pressure, qp. Since the change in internal energy is equal to the sum of heat and work, enthalpy can be related to change in internal energy if the system is at constant pressure.
Delta U equals delta H + w when pressure is constant. At constant pressure q=delta H. Another helpful equation in this scenario is delta u=delta h-delta n RT. This can be used when you have gas values other thank P and V.
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