PPT Slide

(b) Heat is on the left (reactant), so _H >0 and the reaction is endothermic.

18

• Certain enthalpy changes represent such common processes that  they are given specific names:

• One mole of a substance combines with oxygen in a combustion  reaction; the heat of reaction is the heat of combustion (_H comb ):

• When one mole of compound forms from its elements, the heat of  reaction is the heat of formation (_H f ):

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