50 grams NaCl are dissolved in water to make a 1.5 M solution. What is the volume of the solution in mL.

Answer 1

Molarity, M, is the number of moles of a solute in the 1 liter of total solution (mol/L). And moles = mass in grams/molar mass.

We need the molar mass of NaCl (~58 g/mol) to calculate the number of moles of NaCl in the solution.

(1 mol/58 g) 50 g = 0.86 mol NaCl

We have the molarity (1.5 mol/L) so Vol = moles/M = (0.86 mol) (1 L/1,5 mol) = ~ 0.57 L which would be ~ 574 mL (or to two sig figs, 5.7 x 10² mL