A concentration of 120.9132 g of MgO in 3 L of solution will be what molality? (The atomic weight are: Magnesium: 24.305 g/mol, Oxygen: 15.9994 g/mol)

Recall that molality is the concentration of a solute in a solution relative to the amount of substance in a specified mass of the solvent. We will begin by calculating the number of moles in the 120.9132 g of MgO- notice that the atomic weights are given in g/mol