Question

What is the mass of sodium chloride used to create a 100 mL solution at a concentration of 1.5 M? Your solution must include a step-by-step solution with units included throughout.

Answer 1

Molarity of a solution is given by the formula,

Molarity = moles of solute/volume of solution in liters.

Number of moles = Mass/Molar mass

Molar mass of sodium chloride = 58.44 g/mol

Volume of Solution = 100 ml

1 ml = 1000 ml

Volume = 0.1 L

Moles of NaCl = 1.5 M × 0.1 L

Moles = 0.15 moles

Mass of Sodium chloride = 0.15 mol × 58.44 g/mol

= 8.77 g

Mass of sodium chloride = 8.77 grams