chemistry wizards plzz help?

Question

How much H2O must be added to 74.5 g of
Ca(NO3)2 to form a 0.300msolution? Answer
in units of kg.

Answer 1

molality is moles solute/kg solvent. 74.5 g of Ca(NO3)2 is 0.454 moles. Thus you will need 0.454/0.300 or 1.51 kg of water, or 1510 g of water, to produce the 0.300 molal solution.