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Home » The H-H bond energy is 430 KJ/mol and Cl-Cl bond energy is 240 KJ/mol. for HCl is 90 KJ/mol. Then HCl bond energy is
The H-H bond energy is 430 KJ/mol and Cl-Cl bond energy is 240 KJ/mol. \Delta {{H}_{f}} for HCl is 90 KJ/mol. Then HCl bond energy is
Chemistry | Chemistry | MHTCET
The H-H bond energy is 430 KJ/mol and Cl-Cl bond energy is 240 KJ/mol. \Delta {{H}_{f}} for HCl is 90 KJ/mol. Then HCl bond energy is
  1. 360 KJ/mol
  2. 213 KJ/mol
  3. 180 KJ/mol
  4. 425 KJ/mol

Solution: 425 KJ/mol

\frac{1}{2}{{H}_{2}}(g)+\frac{1}{2}C{{l}_{2}}(g)\,\,\to \,\,HCl

\Delta {{H}_{f}}=-90KJ

\Delta {{H}_{f}}=~B.E\text{ }for\text{ }reactants-B.E\text{ }for\text{ }products.

-90=\frac{430}{2}+\frac{240}{2}-~B.E\text{ }of~HCl

-90=215+120-~B.E\text{ }of~HCl

-90=335-~B.E\text{ }of~HCl

B.E.\text{ }of~HCl~=335+90=425KJ-mol{{e}^{-1}}

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