MDCAT Chemistry MCQ #2822

What is the molarity of a solution containing 4.0 g of NaOH (molar mass = 40 g/mol) dissolved in 500 mL of solution?

MDCAT Chemistry MCQ #2822

  1. Question 1

    Q1. What is the molarity of a solution containing 4.0 g of NaOH (molar mass = 40 g/mol) dissolved in 500 mL of solution?

    • A) 0.1 M
    • B) 0.2 M
    • C) 0.3 M
    • D) 0.4 M

    Answer: 0.2 M

    Explanation: Molarity = moles/volume (L). 4.0g/40g/mol = 0.1 mol. 500 mL = 0.5 L. 0.1/0.5 = 0.2 M. Option A fails due to dividing 4.0g by 500.