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"ENTHALPY Definition: H = E + PV We most often care about a change in enthalpy, dH, rather than the absolute value of the enthalpy. dH = dE + d(PV) = (dq + dw) + (VdP + PdV) [Now use the 1st Law of Thermodynamics for dE, and the product rule for d(PV).] The equation above works in any system in equilibrium. We didn’t use any assumptions at all. Under certain circumstances, the equation above gets simpler. The first of these is when the work in the system is only due to a change in pressure·volume, then dw = -PdV" Source and further information: http://depts.washington.edu/chemcrs/bulkdisk/chem452A_win08/notes_2008-01-16p24-29.pdf
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