Question

Energy required to dissociate 4 grams of gaseous hydrogen into free gaseous atoms is 208 kcal at 25⁰C the bond energy of H–H bond will be

• A. $104\mspace{6mu} Kcal$
• B. $10.4\mspace{6mu} Kcal$
• C. $20.8\mspace{6mu} Kcal$
• D. $41.6\mspace{6mu} Kcal$

Answer 1

Answer: (A)

$104\mspace{6mu} Kcal$

Answer 2

4 gram gaseous hydrogen has bond energy 208 kcal

So, 2 gram gaseous hydrogen has bond energy $= \frac{208}{2}kcal$

= 104 kcal.