JAMB Chemistry 2010 Objective — Question 15

Question 15 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2010 Objective paper, with the correct answer and a full explanation.

15. Calculate the solubility in mol dm-3 of 40g of CuSO4 dissolved in 100g of water at 120C. A. 0.40 B. 0.25 C. 4.00 D. 2.50 [Cu=64, S=32, O=16]

A. 0.40
B. 0.25
C. 4.00
D. 2.50Correct

Explanation

Molar mass of CuSO4 = 160g/mol. Moles = 40/160 = 0.25mol. Volume of H2O = 100cm3 = 0.1dm3. Solubility = 0.25/0.1 = 2.5 mol dm-3.

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