WAEC Chemistry 2011 Objective — Question 32
Question 32 of 50 from the West African Examinations Council (WAEC) Chemistry 2011 Objective paper, with the correct answer and a full explanation.
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On evaporation to dryness, 250cm³ of saturated solution of salt X with relative molar mass 101 gave 50.5g of the salt. What is the solubility of the salt?
- A. A. 1.0 moldm⁻³
- B. B. 2.0 moldm⁻³Correct
- C. C. 4.0 moldm⁻³
- D. D. 5.0 moldm⁻³
Explanation
Mole = mass/molar mass = 50.5/101 = 0.5 mol. Volume = 250cm³ = 0.25 dm³. Solubility = mole/volume = 0.5/0.25 = 2 moldm⁻³.
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