Honors Chemistry Practice Exam

A 2.50 g sample of sodium chloride is dissolved to 500.0 mL. What is the molarity of the solution?

0.178 M 0.0856 M 0.0428 M 0.500 M

Correct Answer:

0.0856 M

Explanation:

Molarity tells you how many moles of solute are in one liter of solution, so you convert the mass of solute to moles and the volume to liters, then divide. Molar mass of NaCl is about 58.44 g/mol. The amount of NaCl in 2.50 g is 2.50 g ÷ 58.44 g/mol ≈ 0.0428 mol. The solution volume is 500.0 mL, which is 0.5000 L. Therefore, M = 0.0428 mol ÷ 0.5000 L = 0.0856 M. So the solution’s molarity is 0.0856 M.

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