passwella.
Menu

JAMB Chemistry 1990 Question 16

Question 16

Solubility and Solutions

The solubility in moles per dm3 of 20 g of CuSO4 dissolved in 100 g of water at 180°C is [Cu = 63.5, S = 32, O = 16].

  1. A.0.13
  2. B.0.25
  3. C.1.25
  4. D.2.00
Show the answer and explanation

Answer: C (1.25)

Explanation

20 g ÷ 159.5 g/mol = 0.125 mol in 100 g of water. Scaling to 1000 g (about 1 dm3) gives 1.25 mol/dm3.