What is the molarity of a solution made by mixing 50.0 g of magnesium nitrate, Mg(NO3)2, in enough water to make 250. mL of solution?

Answer 1

Molarity = moles solute/liter of solution

moles solute = 50.0 g Mg(NO3)2 x 1 mol/148 g = 0.338 moles

liters of solution = 250 ml x 1 L/1000 ml = 0.250 L

Molarity (M) = 0.338 mol/0.250 L = 1.35 M