6.6 Introduction to Enthalpy of Reaction

• 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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