Multiple choice

Calculate the density (in g mL–1) of a 2.30 M sulphuric acid solution, i.e. 24.8% H2SO4 (Molar mass = 98 g mol–1) by mass.

  1. 0.78

  2. 0.87

  3. 1.87

  4. 8.73

  5. 1.08
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B Correct answer
Explanation

The relation between molarity (M) and mass percent (%) is given by  M = (% x 10 x d) / MW
 Where  MW = molecular weight of solute and d = density of solution. Therefore, d = M x MW / (% x 10)= 2.30 x 98 / 25.8 x 10= 0.874 g mL-1.

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