Interpretation:
The amount of naphthalene used to change the boiling point of ethanol have to be calculated.
Concept introduction:
For non-volatile and non-electrolyte solutes, the elevation of the boiling point is directly proportional to molalityof the solution.
Boiling point elevation
Where,
Answer to Problem 102A
703 gm of naphthalene used to change the boiling point of ethanol.
Explanation of Solution
Given information:
Mass of the solvent ethanol = 1 kg
Calculate the boiling point elevation.
Write the expression for boiling point elevation.
Calculate the molality of solution from above equation.
(Note: Kb of ethanol = 1.22 °C/m)
Calculate the number of moles of the naphthalene.
Calculate the mass of naphthalene.
(Note: Molecular weight of naphthalene = 128 gm/mol)
Thus, the amount of naphthalene is 703 gm.
Chapter 14 Solutions
Chemistry: Matter and Change
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