Question

what is Raoult's law? Write its mathematical derivation't find the molar mass of non-volatile solute with the help of it.​

Answer 1

Raoult's law states that the vapor pressure of a solvent above a solution is equal to the vapor pressure of the pure solvent at the same temperature scaled by the mole fraction of the solvent present.

P

solution

=χ

solvent

P

solvent

o

The molar mass of a non-volatile solute be determined by using following equation.

P

0

P

0

−P

=

W

1

M

2

W

2

M

1

P

0

= vapour pressure of pure solvent

P= vapour pressure of solution

W

2

= Mass of solute.

M

2

= Molar mass of solute.

W

1

= Mass of solvent.

M

1

= Molar mass of solvent.

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Answer 2

Raoult's law states that the vapor pressure of a solvent above a solution is equal to the vapor pressure of the pure solvent at the same temperature scaled by the mole fraction of the solvent present.

P solution =χ ssolventP solvento

The molar mass of a non-volatile solute be determined by using following equation.

p0-p. W2M1

___= ______

p. W1M2

P 0= vapour pressure of pure solvent

P= vapour pressure of solution

W 2 = Mass of solute.

M 2 = Molar mass of solute.

W 1 = Mass of solvent.

M 1= Molar mass of solvent