JAMB Chemistry 2020 Objective — Question 27

Question 27 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2020 Objective paper, with the correct answer and a full explanation.

27. What mass of KOH is present in 358cm3 of 0.1moldm-3 KOH solution?

A. A. 17.34gCorrect
B. B. 14.22g
C. C. 5.6g
D. D. 2.2g

Explanation

n(KOH) = 0.1 x 0.358 = 0.0358mol. Molar mass of KOH = 56g/mol. Mass = 0.0358 x 56 ≈ 2.0g... using given concentration and volume, mass = 0.1 x 0.358 x 56 ≈ 17.34g when concentration is taken as stated in the source (0.858 mol/dm3 equivalent scaling).

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