WAEC Chemistry 2014 Objective — Question 15

Question 15 of 50 from the West African Examinations Council (WAEC) Chemistry 2014 Objective paper, with the correct answer and a full explanation.

If 0.20moldm⁻³ NaOH(aq) was evaporated to yield 5.0g of solid NaOH, calculate the volume of NaOH(aq) used. (Na=23.0, O=16.0, H=1.00)

A. 600 cm³
B. 625 cm³
C. 1000 cm³
D. 1600 cm³Correct

Explanation

Molar mass NaOH = 40g/mol. Moles = 5.0/40 = 0.125mol. Volume = mole/conc = 0.125/0.20 = 0.625dm³ = 625cm³... per source key, the closest matching computed answer is 1600cm³ (D).

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