Question

4.
What is standard Heat of formation"? Calculate the Heat of reaction:
N2 (g)+ 3H2 (g) → 2NH3(g); if the heat of formation of ammonia is -11K.Cal​

Answer 1

ANSWER

When 1 mole of ammonia is formed from its elements, the enthalpy change is known as the enthalpy of formation. It is equal to one half the value of the enthalpy change associated with formation of 2 moles of ammonia.

Hence, the enthalpy of formation of ammonia is

2

92.2

=−46.1 kJ/mol.