The boiling point elevation is a colligative property. From the calculations, the boiling point of the ethanol - sugar solution is 78.65°C.
What are colligative properties?
The term colligative properties refers to those properties that depend on the number of solute particles present.
Number of moles of sugar = 20 g/342.3 g/mol = 0.058 moles
Boiling constant of ethanol = 1.22 °C⋅kg/mol
Molality of the solution = 0.058 moles/250 * 10^-3 = 0.232 m
Since sugar is a molecular substance, the Van't Hoff factor is 1
The normal boiling point of pure ethanol is 78.37 °C
ΔT = K m i
ΔT = 1.22 °C⋅kg/mol * 0.232 m * 1
ΔT = 0.28°C
Boiling point of solution = 78.37 °C + 0.28°C = 78.65°C
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