Question

. When 50 g of a nonvolatile solute is dissolved in a certain quantity of solvent, the elevation of boiling point is

2.0 K. What will be the elevation of boiling point when 30 g of solute is dissolved in the same amount of the

same solvent?​

Answer 1

Yes its is a solvent

Answer 2

Given info : When 50 g of a nonvolatile solute is dissolved in a certain quantity of solvent, the elevation of boiling point is 2.0 K.

To find : What will be the elevation of boiling point when 30g of solute is dissolved in the same amount of solvent ?

solution : elevation of boiling point is directly proportional to molality of solution.

i.e., ∆T₁/∆T₂ = m₁/m₂

here ∆T₁ = 2K,

m₁ = no of moles of solute/mass of solvent in kg

let M g/mol is molar mass of solute and mass of solvent is x g

so, initial molality , m₁ = (50g/M)/x × 1000

now final molality , m₂ = (30/M)/x × 1000

∴ 2K/∆T₂ = {(50/M)/x × 1000}/{30/M × 1000}

⇒∆T₂ = 6/5 = 1.2 K

Therefore the elevation of boiling point will be 1.2 K