1.

The bond energy of ann O-H bond is 109 kcal/mol. When 1 mole of water is formed, then

Answer»

1009 kcal is RELEASED
218 kcal is ABSORBED
109 kcal is absorbed
218 kcal is released.

Solution :Bond energy of O-H bond =109 kcal/mol
`THEREFORE`Energy absorbed in the dissociation of 1 mole of water
`(H_(2)O)=2xx109=218`kcal
`therefore` Energy released in the formation of 1 mole of water
=218 kcal


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