Alpha Question Bank for Medical: Chemistry>Chapter 8 - Solutions>Exercise 1>Q 66

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What weight of solute (molecular weight $= 60$ ) is required to dissolve in $180 g$ of water to reduce the vapour pressure $\frac{4}{5} th$ of pure water?

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Important Questions on Solutions

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Alpha Question Bank for Medical: Chemistry>Chapter 8 - Solutions>Exercise 1>Q 67

18 glucose

(C_{6} H_{12} O_{6})

is added to 178.2 g water. The vapour pressure of water (in torr) for this aqueous solution at 273 K is

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Alpha Question Bank for Medical: Chemistry>Chapter 8 - Solutions>Exercise 1>Q 68

The mass of glucose that should be dissolved in

100 g

of water in order to produce same lowering of vapour pressure as is produced by dissolving

1 g

of urea (molecular mass

= 60

) in

50 g

of water is:

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Alpha Question Bank for Medical: Chemistry>Chapter 8 - Solutions>Exercise 1>Q 69

Relative decrease in vapour pressure of an aqueous

NaCl

is

0.167

. Number of moles of

NaCl

present in

180 g

of

H_{2} O

is

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Alpha Question Bank for Medical: Chemistry>Chapter 8 - Solutions>Exercise 1>Q 70

An aqueous solution is

1.00

molal in

KI

. Which change will cause the vapour pressure of the solution to increase?

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Alpha Question Bank for Medical: Chemistry>Chapter 8 - Solutions>Exercise 1>Q 71

The vapour pressure of pure benzene

C_{6} H_{6}

at

50 ° C

is

268 torr .

How many moles of non-volatile solute per mole of benzene is required to prepare a solution of benzene having a vapour pressure of

167 torr

at

50 ° C

?

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Alpha Question Bank for Medical: Chemistry>Chapter 8 - Solutions>Exercise 1>Q 72

The vapour pressure of pure liquid

A

is

10 torr

and at the same temperature when

1 g

of

B

solid is dissolved in

20 g

of

A

, its vapour pressure is reduced to

9.0 torr

. If the molecular mass of

A

is

200 amu

, then the molecular mass of

B

is:

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Alpha Question Bank for Medical: Chemistry>Chapter 8 - Solutions>Exercise 1>Q 73

The vapour pressure of a solution of a non-volatile solute

B

in a solvent

A

is

95 %

of the vapour pressure of the solvent at the same temperature. If the molecular weight of the solvent is

0.3

times the molecular weight of the solute, what is the ratio of weight of solvent to solute?

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Alpha Question Bank for Medical: Chemistry>Chapter 8 - Solutions>Exercise 1>Q 74

The lowering of vapour pressure of

0.1 M

aqueous solution of

NaCl, {CuSO}_{4}

and

K_{2} {SO}_{4}

are: