A) 109 kcal is released
B) 218 kcal is absorbed
C) 109 kcal is absorbed
D) 218 kcal is released
Correct Answer: D
Solution :
Bond energy of O?H bond = 109 kcal/mol \[\therefore \]energy absorbed in the dissociation of 1 mol of water \[({{H}_{2}}O)=2\times 109=218\,\text{k}\,\text{cal}\] \[\therefore \]Energy released in the formation of 1 mol of water\[\text{ }\!\!~\!\!\text{ =}\,\text{218 kcal}\text{.}\]
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