JAMB Chemistry 2016 Objective — Question 24
Question 24 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2016 Objective paper, with the correct answer and a full explanation.
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24. What is the concentration of a solution containing 2g of NaOH in 100cm3 of solution? [Na = 23, O = 16, H = 1] A. 6.05 moldm-3 B. 0.30moldm-3 C. 0.50moldm-3 D. 0.40mol dm-3
- A. 6.05 moldm-3
- B. 0.30moldm-3Correct
- C. 0.50moldm-3
- D. 0.40mol dm-3
Explanation
Mass of NaOH = 2g; Molar mass of NaOH = 40gmol-1; Mole = 2g/40gmol-1 = 0.05mol; Volume of solution = 100cm3 = 0.1dm3; Concentration = 0.05mol/0.1dm3 = 0.5moldm-3.
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