The number of molecules and moles in 2 . 8375 litres of O 2 at STP are respectively

7 . 527 × 10 22 and 0 . 125 mol

7 . 527 × 10 23 and 0 . 125 mol

7 . 527 × 10 22 and 0 . 250 mol

1 . 505 × 10 23 and 0 . 250 mol

The chemical equation for the manufacture of ammonia is N 2 ( g ) + 3 H 2 ( g ) → 2 NH 3 ( g ) What will be the volume of NH 3 formed at STP, if 22 . 4 L of N 2 is completely reacted?

22 . 4 L N 2 is equal to 1 mol N 2 1 mol N 2 undergoes reaction to produce 2 mol NH 3 . Therefore, the volume of NH 3 formed at STP = 2 × 22 . 4 = 44 . 8 L .

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Number of atoms in $1 mL$ of ammonia gas at STP 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>Moles and Gases

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>Moles and Gases

The volume of one mole of any gas is _____ L.

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Moles and Gases

The number of water molecules is maximum in

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Moles and Gases

An amount of

18 g

glucose corresponds to:

HARD

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Moles and Gases

Calculate the volume occupied by

80 g

of carbon dioxide at STP.

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Moles and Gases

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>Moles and Gases

The number of molecules and moles in

2.8375

litres of

O_{2}

STP

are respectively

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Moles and Gases

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

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Moles and Gases

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

HARD

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Moles and Gases

State the volume occupied by

40 gm

of methane at STP, if its vapour density (V.D.) is

8

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Moles and Gases

The amount of oxygen in

3.6

moles of water is:

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Moles and Gases

At S.T.P. the volume of

7.5 g

of a gas is

5.6 L

. The gas is

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Moles and Gases

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

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Moles and Gases

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

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Moles and Gases

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?

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Moles and Gases

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)

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Moles and Gases

Which one of the followings has maximum number of atoms?

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Moles and Gases

The chemical equation for the manufacture of ammonia is $N_{2} (g) + 3 H_{2} (g) \to 2 {NH}_{3} (g)$

What will be the volume of ${NH}_{3}$ formed at STP, if $22.4 L$ of $N_{2}$ is completely reacted?

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Moles and Gases

How many moles of methane are present in

11.2 L

at S.T.P.?

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Moles and Gases

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

Number of atoms in 1 mL of ammonia gas at STP is

Important Questions on Some Basic Concepts of Chemistry

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Number of atoms in $1 mL$ of ammonia gas at STP is