- Enthalpy (H) = heat
○ Is an extensive property and state function
○ E is the internal energy of the system, P is the pressure of the system, and V is the volume of the system
○ Units of ΔH = kJ
○ Key Word: standard enthalpy
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- Heat value written on reactant side = endothermic
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- Heat value written on product side = exothermic & ΔH will be negative
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