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The bond energy of an O-H bond is $$109\text{ kcal mol}^{-1}$$. When $$5 \times 10^{-3}$$ mole of water is formed, the energy released in k.cal is ____.
Correct Answer: 1.09
Each water molecule has two O-H bonds, so forming one mole of water from atoms releases $$2 \times 109 = 218\text{ kcal}$$. For $$5 \times 10^{-3}$$ mol, the energy released is $$218 \times 5 \times 10^{-3} = 1.09\text{ kcal}$$.
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