PPT Slide

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1. Sign of _H. The _H of a forward reaction is identical in magnitude but opposite in sign to the _H of the reverse reaction.

Decomposition of 2 mol water into its elements (endothermic):

Formation of 2 mol water from its elements (exothermic):

2. Magnitude of _H. The size of _H is proportional to the amount of substance in the reaction.

Formation of 1 mol water from its elements (1/2 the above):

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Notes:

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