What would you need to do to calculate the molality of 10 g of NaCl in 2kg of water?

58,49 g NaCl---------------------1 N
10 g---------------------------------x
x= 10/58,49=0,171 N
58,49 is the molar mass of NaCl (for the foemula unit).

Molality= 0,171/2=0,085