Question

Bond enthalpies of H – H, Cl – Cl and H – Cl bonds are 434 kJ mol^-1, 242 kJ mol^-2 and 431 kJ mol^-1, respectively. Enthalpy of formation of HCl is

(a) 245 kJ mol^-1

(b) -93 kJ mol^-1

(c) -245 kJ mol^-1

(d) 93 kJ mol^-1

Answer 1

Correct answer is

(b) -93 kJ mol^-1