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Standard XII

Chemistry

Raoult's Law

0.440 g of a ...

Question

$0.440 g$ of a substance dissolved in $22.2 g$ of benzene lowered the freezing point of benzene by ${0.567}^{\circ} C$ . The molecular mass of the substance ( $K_{f} = {5.12}^{\circ} C k g m o l$ )

178.9

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177.8

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176.7

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175.6

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Solution

The correct option is A $178.9$
The correct answer is A.

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Similar questions

Q. On dissolving

0.25 g

of a non volatile substance in

30 m L

of benzene (Density of benzene

0.8 g / m L

) its freezing point decreases by

{0.40}^{\circ} C

. Calculate the molar mass of non - volatile substance

(K_{f} = 5.12 K k g m o l^{- 1})

Q. A certain mass of substance, when dissolved in 100 g

C_{6} H_{6},

lowers the freezing point by

{1.28}^{\circ} C .

The same mass of solute dissolved in 100 g water lowers the freezing point by

{1.40}^{\circ} C .

If the substance has normal molecular weight in benzene and is completely ionized in water, into how many ions does it dissociate in water?

K_{f}

for

H_{2} O

and

C_{6} H_{6} O

are 1.86 and 5.12 K kg

m o l^{- 1} .

Q. On dissolving 0.25 g of a non-volatile substance in 30 mL benzene (density 0.8 g / mL), its freezing point decreases by

{0.40}^{o} C

. Calculate the molecular mass of non-volatile substance (

K_{f} = 5.12 K k g m o l^{- 1}

Q. A certain mass of a substance, when dissolved in 100 g of

C_{6} H_{6}

, lowers the freezing point by

{1.28}^{o} C

.The same mass of solute dissolved in 100 g of water lowers the freezing point by

{1.40}^{o} C

.If the substance has normal molecular weight in benzene and is completely dissociated in water, into how many ions does it dissociate in water?

K_{f}

for

H_{2} O

and

C_{6} H_{6}

is 1.86 and

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

, respectively:

Q. A certain mass of a substance, when dissolved in

100

g C

_{6}

_{6}

, lowers the freezing point by 1.28

^{o}

C. The same mass of solute dissolved in

100

g water lowers the freezing point by

1.40

^{o}

C. If the substance has a normal molecular weight in benzene and is completely ionized in water, thus, how many ions does it dissociate in water?

[

K

_{f}

for H

_{2}

O and C

_{6}

_{6}

are

1.86

and

5.12

K kg mol

^{- 1}

]

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0.440g of a substance dissolved in 22.2g of benzene lowered the freezing point of benzene by 0.567∘C . The molecular mass of the substance (Kf=5.12∘Ckgmol)

The correct option is A 178.9The correct answer is A.

$0.440 g$ of a substance dissolved in $22.2 g$ of benzene lowered the freezing point of benzene by ${0.567}^{\circ} C$ . The molecular mass of the substance ( $K_{f} = {5.12}^{\circ} C k g m o l$ )

The correct option is A $178.9$
The correct answer is A.