What is the molarity of 0.50 liter of an aqueous solution that contains 0.20 mole of NaOH (gram-f

January 2019 NY Regents Chemistry Exam

38 What is the molarity of 0.50 liter of an aqueous solution that contains 0.20 mole of NaOH (gram-formula mass = 40. g/mol)? (1) 0.10 M

(2) 0.20 M (3) 2.5 M

(4) 0.40 M

Solution:Table T on the Reference Table provides the formula for molarity

molarity = moles of solute/liters of solution

M = 0.20 mol/0.50L =0.40M

Answer: 4

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