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Byju's Answer

Standard XII

Chemistry

Van't Hoff Factor

The addition ...

Question

The addition of 3 gm of substance to 100 gm $C C l_{4} (M = 154 g m m o l^{- 1})$ raises the boiling point of $C C l_{4}$ by ${0.60}^{\circ} C K_{b}$ of $C C l_{4}$ is 5.03 kg $m o l^{- 1}$ K.

Calculate :

(a) the freezing point depression
(b) the relative lowering of vapour pressure
(c) the osmotic pressure at 298 K
(d) the molar mass of the substance

[Given : $K_{f} (C C l_{4}) = 31.8 k g m o l^{- 1} K$ and density of solution = $1.64 g m / c m^{3}$ ]

(a)

{3.79}^{\circ} C,

(b)

0.018, (c) 4.65 a t m, (d) 251.5

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(a)

{4.98}^{\circ} C,

(b)

0.038, (c) 43.5 a t m, (d) 230.2

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(a)

{6.2}^{\circ} C,

(b)

0.0..98, (c) 4.65 a t m, (d) 292.7

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None of these

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Solution

The correct option is A (a) ${3.79}^{\circ} C,$ (b) $0.018, (c) 4.65 a t m, (d) 251.5$

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Similar questions

Q. The addition of

3 g

of substance to

100 g C C l_{4} (M = 154 g m o l 6 - 1)

raises the boiling point of

C C l_{4}

{0.60}^{\circ} C

K_{b} (C C l_{4})

5.03 k g m o l^{- 1} K

. Calculate:
(a)

the freezing point depression
(b)

the relative lowering of vapour pressure
(c)

the osmotic pressure at

298 K

(d)

the molar mass of the substance
Given

K_{f} (C C l_{4}) = 31.8 k g m o l^{- 1} K

and

ρ (d e n s i t y) o f s o l u t i o n = 1.64 g / c m^{3}

The addition of

3 g

of a substance to

100 g C C l_{4} (M = 154 g m o l^{- 1}

) raises the boiling point of

C C l_{4}

{0.60}^{\circ} C

. If

K_{b} (C C l_{4})

5 K m o l^{- 1} k g

, calculate the molar mass of the substance.

Given:

K_{f} (C C l_{4}) = 31.8 K k g m o l^{- 1}

ρ (s o l u t i o n) = 1.64 g c m^{- 3}

.
(Answer in g/mol)

Q. For a dilute solution containing

2.5 g m

of a non-volatile non-electrolyte solute in

100 g m

of water, the elevation in boiling point at

1 a t m

pressure is

2^{o} C

. Assuming concentration of solute is much lower than the concentration of solvent, the vapour pressure (mm of

H g

) of the solution is (

K_{b} = 0.76 K k g m o l^{- 1})

Q. The boiling point of an aqueous urea solution is

101.04^{\circ} C

. The density of solution is 1.12 g/mL. Which of the following is/are correct statement(s) regarding this solution?
[Given: For water,

K_{b} = 0.52 {K kg mol}^{- 1}, K_{f} = 1.86 {K kg mol}^{- 1}

]

Q. Vapour pressure of

C C l_{4}

25^{o}

C is

143

mm of Hg.

0.5

g of a non-volatile solute (mol. Mass

= 65

) is dissolved in

100

C C l_{4}

. Find the vapour pressure of the solution: (Density of

C C l_{4} = 1.58 g / c m^{3}

)

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The correct option is A (a)3.79∘C,(b)0.018,(c)4.65atm,(d)251.5

The correct option is A (a) ${3.79}^{\circ} C,$ (b) $0.018, (c) 4.65 a t m, (d) 251.5$