question_answer

Bond dissociation enthalpy of \[{{H}_{2}},C{{l}_{2}}\] and \[HCl\] are 434, 242 and 431 kJ \[mo{{l}^{-1}}\] respectively. Enthalpy of formation of HCl is                                                                                                                     [AIPMT (S) 2008]

A)  \[93\,kJ\,mo{{l}^{-1}}\]          

B)       \[-245\,kJ\,mo{{l}^{-1}}\]

C)  \[-93\,kJ\,mo{{l}^{-1}}\]         

D)       \[245\,kJ\,mo{{l}^{-1}}\]

Correct Answer: C

Solution :

Key Idea:

energy of reactant Bond energy of product

Here,