Iron Ionization Energy

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

Fe -> Fe¹⁺ = 759.3 kJ/mol = 181.65 Kcal/mol
Fe¹⁺ -> Fe²⁺ = 1561 kJ/mol = 373.44 Kcal/mol
Fe²⁺ -> Fe³⁺ = 2957 kJ/mol = 707.42 Kcal/mol
Fe³⁺ -> Fe⁴⁺ = 5290 kJ/mol = 1265.55 Kcal/mol
Fe⁴⁺ -> Fe⁵⁺ = 7240 kJ/mol = 1732.06 Kcal/mol
Fe⁵⁺ -> Fe⁶⁺ = 9600 kJ/mol = 2296.65 Kcal/mol
Fe⁶⁺ -> Fe⁷⁺ = 12100 kJ/mol = 2894.74 Kcal/mol
Fe⁷⁺ -> Fe⁸⁺ = 14575 kJ/mol = 3486.84 Kcal/mol
Fe⁸⁺ -> Fe⁹⁺ = 22678 kJ/mol = 5425.36 Kcal/mol
Fe⁹⁺ -> Fe¹⁰⁺ = 25290 kJ/mol = 6050.24 Kcal/mol