Question

calculate the standard enthalpy
N2 H4+ H2
2NH3
H = ?
ΔΑ
N-H - 392 kil mole
Н - Н
430kmore
N-N
170 k mole​

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.