question_answer

Given that bond energies of \[H-H\] and \[Cl-Cl\]  are \[430\text{ }kJ\text{ }mo{{l}^{-1}}\] and \[240\text{ }kJ\text{ }mo{{l}^{-1}}\] respectively and \[\Delta {{H}_{f}}\] for \[HCl\] is \[-90\text{ }kJ\text{ }mo{{l}^{-1}}\]. Bond enthalpy' of \[HCl\] is:                                                                                                                   [AIPMT (S) 2007]

A)  \[290\text{ }kJ\text{ }mo{{l}^{-1}}\]

B)                   \[380\text{ }kJ\text{ }mo{{l}^{-1}}\]

C) \  \[425\text{ }kJ\text{ }mo{{r}^{-1}}\]   

D)   \[245\text{ }kJ\text{ }mo{{l}^{-1}}\]

Correct Answer: B

Solution :