Nitrogen Ionization Energy

The Nitrogen Ionization Energy is the energy required to remove from atom one mole of electrons with subsequent production of positively charged ion of Nitrogen.
N -> N⁺ + e^-
This process can be repeated many times, but the energy cost is increased dramatically. The general equation for the Nitrogen is:
N^N+ -> N^(N+1)+ + e^-

N -> N¹⁺ = 1402.3 kJ/mol = 335.48 Kcal/mol
N¹⁺ -> N²⁺ = 2856.1 kJ/mol = 683.28 Kcal/mol
N²⁺ -> N³⁺ = 4578 kJ/mol = 1095.22 Kcal/mol
N³⁺ -> N⁴⁺ = 7474.9 kJ/mol = 1788.25 Kcal/mol
N⁴⁺ -> N⁵⁺ = 9440 kJ/mol = 2258.37 Kcal/mol
N⁵⁺ -> N⁶⁺ = 53265.6 kJ/mol = 12742.97 Kcal/mol
N⁶⁺ -> N⁷⁺ = 64358.7 kJ/mol = 15396.82 Kcal/mol