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Elevation in Boiling Point

The molal ele...

Question

The molal elevation constant is the ratio of the elevation in boiling point to:

A

molarity

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B

molality

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C

mole fraction of solute

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D

mole fraction of solvent

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Solution

The correct option is B molality
Due to solute presence in the solution, the solution's boiling point is greater than the pure solvent's boiling point. This is called as elevation in boiling point and it can be represented as:
$Δ T_{b} = K_{b} \times m o l a l i t y$

$K_{b} = \frac{Δ T_{b}}{m o l a l i t y}$

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Similar questions

Q. Assertion :Molal elevation constant depends on the nature of the solvent.
Reason: Molal elevation constant is the elevation in boiling point when

1 m o l e

of the solute is dissolved in

1 k g

The molal elevation constant is the elevation in boiling point of

Q. Among the following which statements about boiling-point elevation is not true?
I. Addition of a nonvolatile solute raises the vapor pressure of a solution. Therefore, a higher temperature will be needed to produce boiling.
II. The molal concentration of solute particles dissolved in the solvent is an important factor in determining the molal boiling-point elevation constant.
III. The identity of solute particles dissolved in the solvent is an important factor in determining the molal boiling-point elevation constant.

Q. The rise in the boiling point of a solution containing 1.8g of glucose in 100g of solvent is

{0.1}^{o} C

. The molal elevation constant of the liquid is:

Q. If the elevation in boiling point of a solution of

10

g of solute(mol. wt.

= 100

100

Δ T_{b}

, the ebullioscopic constant of water is:

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