NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>Follow Up Problems>Q 27

HARD

12th West Bengal Board

IMPORTANT

Earn 100

Water is used in car radiators. In winter season, ethylene glycol is added to water so that water may not freeze:
Assuming ethylene glycol to be non-volatile, calculate minimum amount of ethylene glycol that must be added to $6.0 kg$ of water to prevent it from freezing at $- 0.3 ° C .$ The molal depression constant of water is $1.86 ° .$

Important Questions on Solutions

HARD

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>Follow Up Problems>Q 28

$45 g$ of ethylene glycol $C_{2} H_{6} O_{2}$ is mixed with $600 g$ of water. Calculate the freezing point depression.

HARD

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>Follow Up Problems>Q 28

$45 g$ of ethylene glycol, $C_{2} H_{6} O_{2}$ is mixed with $600 g$ of water. Calculate the freezing point of the solution.

MEDIUM

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>Follow Up Problems>Q 29

1.00 g

of a non electrolyte solute dissolved in

50.0 g

of benzene lowered the freezing point of benzene by

0.40 K .

The freezing point depression constant of benzene is

5.12 K kg mol^{- 1} .

Find the molecular mass of the solute.

HARD

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>Follow Up Problems>Q 30

Calculate the osmotic pressure of an aqueous solution containing

1 g

each of sucrose and glucose per

{dm}^{3}

at

300 K .

If this pressure was measured and it were not known that the solute was a mixture, what molecular weight would be expected?

HARD

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>Follow Up Problems>Q 31

Calculate the concentration of that solution of sugar which has osmotic pressure

2.46

atmosphere at

27 ° C .

MEDIUM

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>Follow Up Problems>Q 32

A

4

percent solution of sucrose

(C_{12} H_{22} O_{11})

is isotonic with

3

percent solution of an unknown organic substance. Calculate the molecular weight of the unknown substance.

HARD

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>Follow Up Problems>Q 33

The given aqueous solution of a protein contains

1.26 g

of the protein in

200 {cm}^{3}

solution. The osmotic pressure of this solution at

300 K

is found to be

2.57 \times 10^{- 3} bar .

Calculate the molar mass of the protein.

HARD

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>Follow Up Problems>Q 34

0.6 mL

of acetic acid

({CH}_{3} COOH),

having density

1.06 g {mL}^{- 1},

is dissolved in

1

litre of water. The depression in freezing point observed for this strength of acid was

0.0205 ° C .

Calculate the van't Hoff factor and the dissociation constant of acid.