Bond dissociation enthalpy of ,
and
are 434, 242, and 431 kJ
respectively. Enthalpy formation of HCl is:
For the reaction,
Now, is the enthalpy change for the formation of 1 mole of molecules, while
is the enthalpy change for the reaction in which 2 moles of HCl are formed. Hence, for 1 mole of HCl
The Correct answer is option 3.