An aqueous solution containing 288 g of a non-volatile compound, having the stoichiometric composition C n H 2 n O n in 90 . 0 g of water, boils at 101 . 24 ° C under 1 . 00 atm pressure. What is the molecular formula of the given compound?

The formula used for calculating elevation in boiling point is, ∆ T b = K b × m . Where, K b = molal elevation constant and m = molality. Molality can be written as m = w × 1000 GMM × W where w = weight of the solute, W = weight of the solvent and GMM = Gram molecular mass. GMM of the solute ( C n H 2 n O n ) = 12 n + 2 n + 16 n = 30 n . Hence, putting the values in the above equations, we get, 1 . 24 = 0 . 512 × 288 × 1000 30 n × 90 n = 1321 . 29 30 n = 44 Therefore, n = 44 and GMM = 30 × 44 = 1320 .

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The diagram given below depicts the boiling point as the function of composition of the mixture of ${CCl}_{4}$ and ${SiCl}_{4}$ . Which of the following statement about the diagram is/are true?

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Important Questions on Solutions

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JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part - 2 JEE Main & Advanced>Chapter 2 - Solutions>DPP 2.3>Q 1

Explain why on the addition of

1

mole of

NaCl

1 L

of water, the boiling point of water increases, while the addition of a mole of methyl alcohol to

1 L

of water, decreases its boiling point?

EASY

JEE Main

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Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part - 2 JEE Main & Advanced>Chapter 2 - Solutions>DPP 2.3>Q 2

What is the reason that the vapour pressure of an aqueous solution of glucose is lower than that of water?

EASY

JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part - 2 JEE Main & Advanced>Chapter 2 - Solutions>DPP 2.3>Q 3

2 g

each of two non-electrolyte solutes

A

and

B

(molar mass of

A

is greater that of

B

) are dissolved separately in

50 g

each of the same solvent. Which one will show a greater elevation in the boiling point?

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JEE Main

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Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part - 2 JEE Main & Advanced>Chapter 2 - Solutions>DPP 2.3>Q 3

An aqueous solution containing

288 g

of a non-volatile compound, having the stoichiometric composition

C_{n} H_{2 n} O_{n}

90.0 g

of water, boils at

101.24 ° C

under

1.00

atm pressure. What is the molecular formula of the given compound?

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JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part - 2 JEE Main & Advanced>Chapter 2 - Solutions>DPP 2.3>Q 4

A solution contains

30 g

of a non-volatile solute in exactly

90 g

of water, it has a vapour pressure

21.85 mm

Hg

25 ° C .

Further,

18 g

of water is then added to the solution, the new vapour pressure becomes

22.15 mm

Hg

25 ° C

. Calculate the molar mass of the solute.

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JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part - 2 JEE Main & Advanced>Chapter 2 - Solutions>DPP 2.3>Q 4

A solution contains $30 g$ of a non-volatile solute in exactly $90 g$ of water, its vapour pressure is $21.85 mm$ of $Hg$ at $25 ° C .$ Further, $18 g$ of water is then added to the solution, the new vapour pressure becomes $22.15 mm$ of $Hg$ at $25 ° C$ . Calculate the vapour pressure of water at $25 ° C$ .

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JEE Main

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Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part - 2 JEE Main & Advanced>Chapter 2 - Solutions>DPP 2.3>Q 5

What mass of the non-volatile solute urea

({NH}_{2} {CONH}_{2})

needs to be dissolved in

100 g

of water, in order to decrease the vapour pressure of water by

25 %

? What will be the molality of the solution?

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JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part - 2 JEE Main & Advanced>Chapter 2 - Solutions>DPP 2.3>Q 6

Molal elevation constant of a liquid is

The diagram given below depicts the boiling point as the function of composition of the mixture of CCl4 and SiCl4. Which of the following statement about the diagram is/are true?

Important Questions on Solutions

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The diagram given below depicts the boiling point as the function of composition of the mixture of ${CCl}_{4}$ and ${SiCl}_{4}$ . Which of the following statement about the diagram is/are true?