When 50cm2 of a saturated solution of sugar of molar mass 342 g at 40oC was evaporated to dryness, 34.2g of dry solid was obtained. The solubility of sugar ...

When 50cm2 of a saturated solution of sugar of molar mass 342 g at 40oC was evaporated to dryness, 34.2g of dry solid was obtained. The solubility of sugar at 40oC is

Answer Details

The question is asking for the solubility of sugar at 40°C given the mass of dry solid obtained after evaporating a known volume of a saturated solution of sugar. To solve this problem, we need to use the formula: Solubility = (mass of solute ÷ molar mass of solute) ÷ (volume of solvent in dm³) Using the given data, we can find the mass of sugar dissolved in 50cm³ of the saturated solution: mass of sugar = 34.2g Next, we need to calculate the number of moles of sugar dissolved: number of moles = mass of sugar ÷ molar mass of sugar = 34.2g ÷ 342g/mol = 0.1mol Finally, we can use the formula to calculate the solubility: solubility = (0.1mol ÷ 0.05dm³) = 2.0 mol dm⁻³ Therefore, the solubility of sugar at 40°C is 2.0 mol dm⁻³. The main labels for this question would be: Chemistry, Solubility, Sugar, Saturated solution, Evaporation, Molar mass, Volume, Mass.