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Enthalpy of vaporization (ΔHvap) is the difference in molar enthalpy (Hm) between the vapor and liquid states. All the "H"s mean enthalpy. The "Δ" in ΔHvap shows the change in enthalpy of the vapor and liquid states. The "m" in Hm indicates that we are using molar enthalpy. Hope this helps!
Also, ΔH of vaporization is the change of enthalpy so to explain the equation you have to take the enthalpy of vapor subtracted from the enthalpy of liquid because it references again final-initial. In this case, vapor is the final product.
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