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JAMB Chemistry 1994 Question 19

Question 19

Solubility and Solutions

The solubility, in moles per dm3 of 20.2 g of potassium trioxonitrate (V) dissolved in 100 g of water at room temperature is [K = 39, O = 16, N = 14]

  1. A.0.10
  2. B.0.20
  3. C.1.00
  4. D.2.00
Show the answer and explanation

Answer: D (2.00)

Explanation

KNO3 has M = 101, so 20.2 g is 0.2 mol in 100 g (about 0.1 dm3) of water. Per dm3 that is 0.2 × 10 = 2.00 mol.