A Newton, N, is a measure of force while a kilogram, kg, is a measure of mass. Therefore, any number of kN does not equal any number of kg.

This however is useful

1 N = 1 kg*m*s^-2

edit:

F=m×a

[F=force; m= mass; a=acceleration (g in case of acceleration due to gravity = 9.08665m/s^2)]

m=F/g=1/9.08665=0,11Kg