A) 109 k cal is released
B) 218 k cal is released
C) 109 k cal is absorbed
D) 218 k cal is absorbed
Correct Answer: B
Solution :
[b] 218 k cal is released Bond energy of O-H bond = 109 k cal/mo means that when 1 mole of O-H bonds are formed, 109 k cal energy is released. (Because dissociation of bond absorbs energy) formation of one mole of water is equivalent to formation of 2 moles of O-H bonds (H-O-H). Hence energy released \[=2\times 109=218\,K\,cal\]
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