Question -
Energy required to dissociate 4g of gaseous hydrogen into free gaseous atoms is 208 Kcal at 25oC. The bond energy of H - H bond will be:
Options:
A .  1.04 Kcal
B .  10.4 Kcal
C .  104 Kcal
D .  1040 Kcal
Answer: Option C : C 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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