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  3. Chemistry
  4. The bond energy of an O-H bond is 109 kcal/mol. When a mole of water is formed, then

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Q. The bond energy of an $ O-H $ bond is $109\, kcal/mol$. When a mole of water is formed, then

J & K CETJ & K CET 2003

Solution:

Bond energy of $O- H$ bond $=109 \,kcal / mol$
$\therefore $ energy absorbed in the dissociation of $1 \,mol$ of water
$\left(H_{2} O\right)=2 \times 109=218 \,kcal$
$\therefore $ Energy released in the formation of $1\, mol$ of water $=218\, kcal$.