Question

define kf and kb. Give mathematical expression to show that kf and kb depends on the nature of solvent..

plz answer fast.​

Answer 1

kf is the krayoscopic constant

kb is the ebillioscopic constant

Answer 2

Answer:

$k_b$ is defined as the elevation in boiling point when 1 mole of the solute is dissolved in 100 g of the solvent.

$k_b=\frac{RT^2}{1000\times L_v}$

where R = gas constant

T = temperature

$L_v$ = heat of vaporisation of solvent

$k_f$ is defined as the depression in freezing point when 1 mole of the solute is dissolved in 100 g of the solvent.

$k_f=\frac{RT^2}{1000\times L_f}$

where R = gas constant

T = temperature

$L_f$ = heat of fusion of solvent

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