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The solubility, in moles per dm3 of 20.2 g of potassium trioxonitrate (V) dissolve in...

Chemistry
JAMB 1994

The solubility, in moles per dm3 of 20.2 g of potassium trioxonitrate (V) dissolve in 100 g of the resulting mixture is?

(K = 39, O = 16, N =14).

  • A. 0.10
  • B. 0.20
  • C. 1.00
  • D. 2.00
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Correct Answer: Option D
Explanation

Given:

Mass of KNO\(_3\) = 20.2g

Volume of solvent = 100g

Molar Mass of KNO\(_3\) = 39 + 14 + (16 x 3) = 101g/mol

Solubility = \(\frac{mass}{Molar mass}\) X  \(\frac{1000}{Volume of solvent}\)

               =  \(\frac{20.2}{101}\) X  \(\frac{1000}{100}\)

               = 2.00 moldm\(^{-3}\)


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