The bond dissociation energies of gaseous H_(2), Cl_(2) and HCl are 104, 58 and 103 kCal/mole respectively. If magnitude of heat of formation of HCl = 11x, x=?

The bond dissociation energies of gaseous H_(2), Cl_(2) and HCl are 10

1.	The bond dissociation energies of gaseous H_(2), Cl_(2) and HCl are 104, 58 and 103 kCal/mole respectively. If magnitude of heat of formation of HCl = 11x, x=?
Answer» Solution :Reaction for formation of HCl is `(1)/(2) H_(2(g)) + (1)/(2) Cl_(2(g)) rarr HCl_((g))` As all are in gaseous state `DELTA H = Sigma` B.E of Reactions `- Sigma` B.E. of PRODUCTS `= (1)/(2) (104) + (1)/(2) (58) - 103 = -22`