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Molecular mass of a volatile substances may be obtained by

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Important Questions on Basic Concepts - Atoms & Molecules

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Chemistry>Physical Chemistry>Basic Concepts - Atoms & Molecules>Equivalent Mass

Calculate the concentration of the

2 % (w / w) NaCl

solution in terms of molality.

EASY

Chemistry>Physical Chemistry>Basic Concepts - Atoms & Molecules>Equivalent Mass

What would be the molality of 20% (mass/mass) aqueous solution of

K I

? (molar mass of

K I = 166 g m o l^{- 1}

)

EASY

Chemistry>Physical Chemistry>Basic Concepts - Atoms & Molecules>Equivalent Mass

Dissolving

120 g

of urea in

1000 g

of water gave a solution of density

1.15 g / mL .

The molarity of the solution is:

EASY

Chemistry>Physical Chemistry>Basic Concepts - Atoms & Molecules>Equivalent Mass

While combusting in air,

4 g

H_{2}

gas was completely converted into water. If

36 μmole

{CO}_{2}

from air is dissolved into that water, what is the concentration of

{CO}_{2}

HARD

Chemistry>Physical Chemistry>Basic Concepts - Atoms & Molecules>Equivalent Mass

What quantity (in

mL

) of a

45 %

acid solution of a mono-protic strong acid must be mixed with a

20 %

solution of the same acid to produce

800 mL

of a

29.875 %

acid solution?

EASY

Chemistry>Physical Chemistry>Basic Concepts - Atoms & Molecules>Equivalent Mass

A litre of seawater (which weighs

1030 g

) contains

6 \times 10^{- 3} g

of dissolved oxygen. The concentration of dissolved oxygen in

ppm

is:

MEDIUM

Chemistry>Physical Chemistry>Basic Concepts - Atoms & Molecules>Equivalent Mass

The mole fraction of glucose

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

in an aqueous binary solution is

0.1 .

The mass percentage of water in it, to the nearest integer, is

\dots \dots \dots

EASY

Chemistry>Physical Chemistry>Basic Concepts - Atoms & Molecules>Equivalent Mass

The number of water molecules in

250 m L

of water is closest to [Given, density of water is

1.0 g m L^{- 1}

; Avogadro's number

= 6.023 \times 10^{23}]

EASY

Chemistry>Physical Chemistry>Basic Concepts - Atoms & Molecules>Equivalent Mass

Which of the following is dependent on temperature?

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Chemistry>Physical Chemistry>Basic Concepts - Atoms & Molecules>Equivalent Mass

Dissolving 120 g of a compound of (mol. wt. 60) in 1000 g of water gave a solution of density 1.12 g/mL. The molarity of the solution is :

EASY

Chemistry>Physical Chemistry>Basic Concepts - Atoms & Molecules>Equivalent Mass

What is the equivalent weight of methanol if one mole of

{CH}_{3} OH

is combusted to form

CO

and

H_{2} O

EASY

Chemistry>Physical Chemistry>Basic Concepts - Atoms & Molecules>Equivalent Mass

What is mole fraction of the solute in a

1.00

m aqueous solution?

MEDIUM

Chemistry>Physical Chemistry>Basic Concepts - Atoms & Molecules>Equivalent Mass

Molality

(m)

18 M H_{2} {SO}_{4}

is, approximately [

d = 1.84 g {cm}^{- 3}

, Molar mass of

H_{2} {SO}_{4} = 98 g {mol}^{- 1}

MEDIUM

Chemistry>Physical Chemistry>Basic Concepts - Atoms & Molecules>Equivalent Mass

A gas mixture contains

25 %

He

and

75 % {CH}_{4}

by volume at a given temperature and pressure. The percentage by mass of methane in the mixture is approximately ___ .

EASY

Chemistry>Physical Chemistry>Basic Concepts - Atoms & Molecules>Equivalent Mass

The mole fraction of ethanol in water is

0.08

. Its molality is

MEDIUM

Chemistry>Physical Chemistry>Basic Concepts - Atoms & Molecules>Equivalent Mass

The

{NaNO}_{3}

weighed out to make

50 mL

of an aqueous solution containing

70.0 mg {Na}^{+}

per

mL

is_

g

. (Rounded off to the nearest integer) [Given : Atomic weight in

{gmol}^{- 1} - Na : 23; N : 14; O : 16

]

HARD

Chemistry>Physical Chemistry>Basic Concepts - Atoms & Molecules>Equivalent Mass

Strength of a

H_{2} O_{2}

solution is labeled as

1.79 N

. Its strength can also be expressed as closest to

MEDIUM

Chemistry>Physical Chemistry>Basic Concepts - Atoms & Molecules>Equivalent Mass

The mole fraction of a solvent in aqueous solution of a solute is

0.8 .

The molality (in mol

{k g}^{- 1}

) of the aqueous solution is:

MEDIUM

Chemistry>Physical Chemistry>Basic Concepts - Atoms & Molecules>Equivalent Mass

The molality of solution containing 15.20 g of urea, (molar mass = 60) dissolved in 150 g of water is

EASY

Chemistry>Physical Chemistry>Basic Concepts - Atoms & Molecules>Equivalent Mass

8 g

NaOH

is dissolved in

18 g

H_{2} O

. Mole fraction of

NaOH

in solution and molality (in

mol {kg}^{- 1}

) of the solution respectively are:

Molecular mass of a volatile substances may be obtained by

Important Questions on Basic Concepts - Atoms & Molecules

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