The Definition of Enthalpy
w = - PDV
DH = DE + PDV
qp = DE + PDV = DH
DH DE for:
1. Reactions that do not involve gases.
2. Reactions in which the number of moles of gas does not change.
3. Reactions in which the number of moles of gas changes but q is >>> PDV.
For reactions that occur at constant pressure….
H is a state function.
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