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Number of molecules present in the $34$ grams of ammonia is _____ .

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Important Questions on Some Basic Concepts of Chemistry

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

Which one of the followings has maximum number of atoms?

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

The ratio of masses of oxygen and nitrogen in a particular gaseous mixture is 1 : 4. The ratio of number of their molecules is:

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

Which one of the following will have the largest number of atoms?

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

Calculate the number of sulphate ions present in

100 ml

0.001 M H_{2} {SO}_{4} ?

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

An unknown chlorohydrocarbon has 3.55 % of chlorine. If each molecule of the hydrocarbon has one chlorine atom only; chlorine atoms present in 1 g of chlorohydrocarbon are :(Atomic wt. of

Cl = 35 .5 u;

Avogadro constant

= 6 .023 \times 10^{23} {mol}^{- 1}

)

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

Which of the following has the largest number of moles?

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

The first and second ionisation enthalpies of a metal are

496

and

4560 k J m o l^{- 1}

, respectively. How many moles of

H C l

and

H_{2} S O_{4},

respectively, will be needed to react completely with

1

mole of the metal hydroxide?

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

At S.T.P. the volume of

7.5 g

of a gas is

5.6 L

. The gas is

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

The volume of oxygen at STP required to burn 2.4 g of carbon completely is:

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

An amount of

18 g

glucose corresponds to:

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

Calculate the mass of

AgCl

precipitated, when

25 ml

35 %

solution of

{AgNO}_{3}

and

25 ml

11.6 %

solution of

NaCl

are mixed is

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

A mixture of gases contains

H_{2}

and

O_{2}

gases in the ratio of

1 : 4

(w/w). What is the molar ratio of the two gases in the mixture?

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

How many moles of electrons will weigh one kilogram ?

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

One mole of carbon atom weighs

12 g

, the number of atoms in it is equal to, (Mass of carbon

- 12

1.9926 \times 10^{- 23} g)

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

Which of the following has the largest number of atoms?

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

An organic compound contains

46.78 %

of a halogen

X

. When

2.00 g

of this compound is heated with fuming

{HNO}_{3}

in the presence of

{AgNO}_{3}, 2.21 g AgX

was formed. The halogen

X

is [Given : atomic weight of

Ag = 108, F = 19, Cl = 35.5

Br = 80, I = 127]

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

The number of moles of water present in a spherical water droplet of radius

1.0 cm

is,
[Given : Density of water in the droplet

= 1.0 g {cm}^{- 3}

]

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

The amount of oxygen in

3.6

moles of water is:

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

Suppose the elements

X

and

Y

combine to form two compounds

X Y_{2}

and

X_{3} Y_{2}

. When

0.1 mole

X Y_{2}

weighs

10 g

and

0.05 mole

X_{3} Y_{2}

weighs

9 g

, the atomic weights of

X

and

Y

are

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Mole Concept and Molar Masses

The number of water molecules is maximum in

Number of molecules present in the 34 grams of ammonia is _____ .

Important Questions on Some Basic Concepts of Chemistry

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Number of molecules present in the $34$ grams of ammonia is _____ .