1.

Energy requried to dissociate 4 g of gaseous hydrogen into free gaseous atoms is 208 kcal at 25^(@)C. The bond energy of H-H will be

Answer»

104 kcal `MOL^(-1)`
52 kcal `mol^(-1)`
10.4 kcal `mol^(-1)`
1040 kcal `mol^(-1)`

Solution :NUMBER of MOLES of hydrogen`=(4g)/(2" g "mol^(-1))=2` moles
Given, `2H_(2)(g)to4H(g),DeltaH=104` kcal `mol^(-1)`. Hence, BOND energy of H-H bond is 104 kcal `mol^(-1)`


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