The bond energy of H_2 is 104.3 kcal ,mol^ -1 . It means (N= Avogadro's number)

JEE Main Chemistry question

The bond energy of is . It means ( Avogadro's number)

(A)104.3 kcal heat is absorbed when atoms of H combine to form molecules of
(B)104.3 kcal heat is required to break up molecules of to atoms of H
(C)104.3 kcal heat is evolved during combination of atoms of H to form molecules of Correct
(D)Heat of formation of H atom bond energy of H─H

Answer: (C)

Solution

Bond energy is the energy associated with breaking 1 mole of H–H bonds (endothermic, absorbing 104.3 kcal, as correctly described by (b)); by the reverse process, forming (combining) molecules of from free H atoms *releases* exactly this amount of energy, matching (c), which is the keyed answer

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Question ID VK-135248