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Question

Energy required to dissociate 4g of gaseous hydrogen into free gaseous atoms is 208 Kcal at 25o C. The bond energy of H - H bond will be:

A

1.04 Kcal

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B

10.4 Kcal

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C

104 Kcal

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D

1040 Kcal

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Solution

The correct option is C

104 Kcal


Energy needed to dissociate 4g is 208 Kcal

Number of moles of H2 = 2 mole
Energy needed to dissociate 1 mole = 2082= 104 Kcal
The bond energy is 104 Kcal in case of H - H bond.

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