JAMB Chemistry 2011 Objective — Question 1

Question 1 of 49 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2011 Objective paper, with the correct answer and a full explanation.

What is the concentration of a solution containing 2g of NaOH in 100cm³ of solution? [Na=23, O=16, H=1]

A. A. 0.30 mol dm⁻³
B. B. 0.40 mol dm⁻³
C. C. 0.50 mol dm⁻³Correct
D. D. 0.05 mol dm⁻³

Explanation

Mass = 2g. Volume = 100cm³ = 0.1dm³. Molar mass of NaOH = 40gmol⁻¹. Mole = 2/40 = 0.05mol. Concentration = 0.05mol/0.1dm³ = 0.50 mol dm⁻³.

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