Question

The standard enthalpy of formation of NH₃ is – 46.0 kJ mol⁻¹. If the enthalpy of formation of H₂ from its atoms is – 436 kJ mol⁻¹ and that of N₂ is – 712 kJ mol⁻¹, the average bond enthalpy of N – H bond in NH₃ is
(a) – 964 kJ mol⁻¹
(b) + 352 kJ mol⁻¹
(c) + 1056 kJ mol⁻¹
(d) – 1102 kJ mol⁻¹

Answer 1

$- 1102kjmol - 1$