MEDIUM

12th ICSE

IMPORTANT

Earn 100

The vapour pressure of pure benzene at a certain temperature is $640 mm Hg$ . A non-volatile solute weighing $2.175 g$ is added to $39.0 g$ of benzene. The vapour pressure of solution is $600 mm Hg$ . What is the molar mass of the solute?

Important Questions on Solutions

MEDIUM

12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>REVIEW EXERCISES>Q 2.55

What weight of glucose (mol. wt.

= 180

) should be added to

1700 g

of water at

20^{0} C

to lower its vapour pressure by

0.001 mm

? The vapour pressure of water at

20^{0} C

17 mm Hg

MEDIUM

12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>REVIEW EXERCISES>Q 2.56

A current of dry air was passed through a solution of

2.5 g

of a non-volatile solute in

100 g

of water and through water alone. The loss in the weight of solution was

1.25 g

and that of water was

0.005 g

. Calculate the molecular mass of the solute.

MEDIUM

12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>REVIEW EXERCISES>Q 2.57

The molal elevation constant for water is

0.56 ° C

per kg of water. Calculate the boiling point of solution made by dissolving

6 g

of urea in

200 g

of water.

MEDIUM

12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>REVIEW EXERCISES>Q 2.58

0.72 g

of camphor in

32 g

of acetone produces an elevation of

0.25 ° C

in the boiling point of acetone. Calculate the molecular mass of camphor. (

k_{b}

for acetone

= 1.72 K kg {mol}^{- 1}

)

MEDIUM

12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>REVIEW EXERCISES>Q 2.59

A solution of

12.5 g

urea in

170 g

of water gave a boiling point elevation of

0.63 K

. Calculate the molar mass of urea taking

K_{b} = 0.52 K / m

HARD

12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>REVIEW EXERCISES>Q 2.6

An aqueous solution of glucose boils at

100.02 ° C

. What is the number of glucose molecules in the solution containing

100 g

of water? What will be the osmotic pressure of this glucose solution at

27 ° C

? (Given :

K_{b}

for water

0.5 K kg {mol}^{- 1}

R = 0.082 L atm {mol}^{- 1} K^{- 1}

, Avogadro's constant,

N_{A} = 6.02 \times 10^{23} {mol}^{- 1}

)

MEDIUM

12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>REVIEW EXERCISES>Q 2.61

An aqueous solution freezes at

272.4 K

, while pure water freezes at

273.0 K

. Determine the molality of the solution. (Given

K_{f} = 1.86 K kg {mol}^{- 1}, K_{b} = 0.512 K kg {mol}^{- 1}

and vapour pressure of water at

298 K = 23.756 mm of Hg

MEDIUM

12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>REVIEW EXERCISES>Q 2.61

An aqueous solution freezes at

272.4 K

, while pure water freezes at

273.0 K

. Determine the boiling point of the solution. (Given

K_{f} = 1.86 K kg {mol}^{- 1}, K_{b} = 0.512 K kg {mol}^{- 1}

and vapour pressure of water at

298 K = 23.756 mm of Hg

The vapour pressure of pure benzene at a certain temperature is 640 mm Hg. A non-volatile solute weighing 2.175 g is added to 39.0 g of benzene. The vapour pressure of solution is 600 mm Hg. What is the molar mass of the solute?

Important Questions on Solutions

Learn and Prepare for any exam you want !

The vapour pressure of pure benzene at a certain temperature is $640 mm Hg$ . A non-volatile solute weighing $2.175 g$ is added to $39.0 g$ of benzene. The vapour pressure of solution is $600 mm Hg$ . What is the molar mass of the solute?