Complete the table given below. Element Atomic mass Molecular mass Atomicity number Chlorine 35.5 71 - Ozone - 48 3 Sulphur 32 - 8 Nitrogen 14 - 2

Element Atomic mass Molecular mass Atomicity number Chlorine 35.5 71 2 Atomicity = Molecular mass Atomic mass = 71 35 . 5 = 2 Chlorine is a diatomic molecule. Atomicity can be defined as the total number of atoms that compose a molecule. Simply put, it is the number of atoms present in a molecule. Element Atomic mass Molecular mass Atomicity number Ozone 16 48 3 Atomic mass = Molecular mass Atomicity number = 48 3 = 16 Ozone is a triatomic molecule. Its molecular formula is O 3 . The mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom. Element Atomic mass Molecular mass Atomicity number Sulphur 32 256 8 Molecular mass = Atomic mass × Atomicity number = 32 × 8 = 256 Sulphur is a polyatomic molecule. Its molecular formula is S 8 . Element Atomic mass Molecular mass Atomicity number Nitrogen 14 28 2 Molecular mass = Atomic mass × Atomicity number = 14 × 2 = 28 Nitrogen is a diatomic molecule. Its molecular formula is N 2 . Molecular mass ( m ) is the mass of a given molecule: it is measured in daltons (Da or u)

5 moles of A B 2 weigh 125 × 10 - 3 k g and 10 moles of A 2 B 2 weigh 300 × 10 - 3 k g . The molar mass of A ( M A ) and molar mass of B ( M B ) in k g m o l - 1 are:

M A = 5 × 10 - 3 and M B = 10 × 10 - 3

M A = 25 × 10 - 3 and M B = 50 × 10 - 3

M A = 50 × 10 - 3 and M B = 25 × 10 - 3

M A = 10 × 10 - 3 and M B = 5 × 10 - 3

Nitroglycerine is used as an explosive. The equation for the explosive reaction is: 4 C 3 H 5 ( NO 3 ) 3 → 12 CO 2 + 10 H 2 O + 6 N 2 + O 2 ( l ) ( g ) ( l ) ( g ) ( g ) Atomic mass of C = 12, H = 1, N = 14, O = 16) How many moles does the equation show for gas molecules produced?

The number of moles of nitroglycerine is 4. The number of moles of gas produced by 4 moles of nitroglycerin are- The number of gas molecules = 12 CO 2 + 6 N 2 + O 2 = 12 + 6 + 1 = 19 moles The mole is the base unit of the amount of substance in the International Unit of System of Units (SI). It is defined as exactly 6 . 022 × 10 23 elementary particles, which may be atoms, molecules, ions, or electrons.

Nitroglycerine is used as an explosive. The equation for the explosive reaction is: 4 C 3 H 5 ( NO 3 ) 3 → 12 CO 2 + 10 H 2 O + 6 N 2 + O 2 (Atomic mass of C = 12, H = 1, N = 14, O = 16) How many moles of gas molecules are obtained from 1 mole of nitroglycerine.

4 moles of nitroglycerine give 19 moles of gas molecules. 1 mole of nitroglycerine gives = 19 4 = 4 . 75 moles Hence, 1 mole of nitroglycerine produces 4.75 moles of gas. The mole is the base unit of the amount of substance in the International Unit of System of Units (SI). It is defined as exactly 6 . 022 × 10 23 elementary particles, which may be atoms, molecules, ions, or electrons.

Nitroglycerine is used as an explosive. The equation for the explosive reaction is: 4 C 3 H 5 ( NO 3 ) 3 → 12 CO 2 + 10 H 2 O + 6 N 2 + O 2 ( l ) ( g ) ( l ) ( g ) ( g ) (Atomic mass of C = 12, H = 1, N = 14, O = 16) How many moles does the equation show for nitroglycerine?

4 C 3 H 5 ( NO 3 ) 3 → 12 CO 2 + 10 H 2 O + 6 N 2 + O 2 The number of moles is shown by nitroglycerine = 4 moles . The mole is the base unit of the amount of substance in the International Unit of System of Units (SI). It is defined as exactly 6 . 022 × 10 23 elementary particles, which may be atoms, molecules, ions, or electrons.

The balanced chemical equation for the formation of ammonia gas by the reaction between nitrogen gas and hydrogen gas is given. N 2 + 3 H 2 → 2 NH 3 Write the ratio between number of moles of reactants and products in the correct order.

Given balanced equation for the reaction is: N 2 + 3 H 2 → 2 NH 3 Form the reaction, number of moles of Nitrogen = 1, hydrogen = 3 and ammonia = 2 Therefore, Ratio between the number of moles of reactants and products is 1 : 3 : 2 This illustrates the Gay Lussac's law of combining volumes of gases.

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The number of oxygen atoms in $4.4 g$ of ${C O}_{2}$ is

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Important Questions on Atoms and Molecules

MEDIUM

Science>Chemistry>Atoms and Molecules>Molecular Mass and Mole Concept

Find how many moles of atoms are there in:

14 g of lithium.

MEDIUM

Science>Chemistry>Atoms and Molecules>Molecular Mass and Mole Concept

Complete the table given below.

Element	Atomic mass	Molecular mass	Atomicity number
Chlorine	35.5	71	-
Ozone	-	48	3
Sulphur	32	-	8
Nitrogen	14	-	2

HARD

Science>Chemistry>Atoms and Molecules>Molecular Mass and Mole Concept

Calculate the amount of each reactant required to produce $750 ml$ of carbon dioxide, when two volumes of carbon monoxide combine with one volume of oxygen to produce two volumes of carbon dioxide.

$2 CO + O_{2} \to 2 {CO}_{2}$

MEDIUM

Science>Chemistry>Atoms and Molecules>Molecular Mass and Mole Concept

Find how many moles of atoms are there in:

32 g of sulphur.

HARD

Science>Chemistry>Atoms and Molecules>Molecular Mass and Mole Concept

An organic compound contains

C, H

and

S

. The minimum molecular weight of the compound containing

8 %

Sulphur is

MEDIUM

Science>Chemistry>Atoms and Molecules>Molecular Mass and Mole Concept

Find how many moles of atoms are there in:

7 g of nitrogen.

MEDIUM

Science>Chemistry>Atoms and Molecules>Molecular Mass and Mole Concept

Find how many moles of atoms are there in:

4.6 g of sodium.

EASY

Science>Chemistry>Atoms and Molecules>Molecular Mass and Mole Concept

The number of moles in $400 g$ ${CaCO}_{3}$ is _____ moles.

[Hint: Gram atomic masses: $Ca = 40 g, C = 12 g, O = 16 g$ ]

EASY

Science>Chemistry>Atoms and Molecules>Molecular Mass and Mole Concept

The percentage composition of carbon by mole in methane is:

EASY

Science>Chemistry>Atoms and Molecules>Molecular Mass and Mole Concept

5

moles of

A B_{2}

weigh

125 \times 10^{- 3} k g

and

10

moles of

A_{2} B_{2}

weigh

300 \times 10^{- 3} k g

. The molar mass of A

(M_{A})

and molar mass of

B (M_{B})

k g {m o l}^{- 1}

are:

MEDIUM

Science>Chemistry>Atoms and Molecules>Molecular Mass and Mole Concept

Nitroglycerine is used as an explosive. The equation for the explosive reaction is:

$4 C_{3} H_{5} {({NO}_{3})}_{3} \overset{}{\to} 12 {CO}_{2} + 10 H_{2} O + 6 N_{2} + O_{2} (l) (g) (l) (g) (g)$

Atomic mass of C = 12, H = 1, N = 14, O = 16)

How many moles does the equation show for gas molecules produced?

EASY

Science>Chemistry>Atoms and Molecules>Molecular Mass and Mole Concept

The number of water molecules is maximum in

MEDIUM

Science>Chemistry>Atoms and Molecules>Molecular Mass and Mole Concept

Nitroglycerine is used as an explosive. The equation for the explosive reaction is:

$4 C_{3} H_{5} {({NO}_{3})}_{3} \overset{}{\to} 12 {CO}_{2} + 10 H_{2} O + 6 N_{2} + O_{2}$

(Atomic mass of C = 12, H = 1, N = 14, O = 16)

How many moles of gas molecules are obtained from 1 mole of nitroglycerine.

MEDIUM

Science>Chemistry>Atoms and Molecules>Molecular Mass and Mole Concept

Find how many moles of atoms are there in:

40 g of calcium.

EASY

Science>Chemistry>Atoms and Molecules>Molecular Mass and Mole Concept

Nitroglycerine is used as an explosive. The equation for the explosive reaction is:

$4 C_{3} H_{5} {({NO}_{3})}_{3} \overset{}{\to} 12 {CO}_{2} + 10 H_{2} O + 6 N_{2} + O_{2} (l) (g) (l) (g) (g)$

(Atomic mass of C = 12, H = 1, N = 14, O = 16)

How many moles does the equation show for nitroglycerine?

EASY

Science>Chemistry>Atoms and Molecules>Molecular Mass and Mole Concept

The balanced chemical equation for the formation of ammonia gas by the reaction between nitrogen gas and hydrogen gas is given.

$N_{2} + 3 H_{2} \to 2 {NH}_{3}$

Write the ratio between number of moles of reactants and products in the correct order.

EASY

Science>Chemistry>Atoms and Molecules>Molecular Mass and Mole Concept

The balanced chemical equation for the formation of ammonia gas by the reaction between nitrogen gas and hydrogen gas is given.

$N_{2} + 3 H_{2} \to 2 {NH}_{3}$

How many moles of ammonia are formed when 6 moles of $N_{2}$ reacts with 6 moles of $H_{2}$ ?

EASY

Science>Chemistry>Atoms and Molecules>Molecular Mass and Mole Concept

In which case the number of molecules of water maximum?

EASY

Science>Chemistry>Atoms and Molecules>Molecular Mass and Mole Concept

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

Science>Chemistry>Atoms and Molecules>Molecular Mass and Mole Concept

The amount of sugar

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

required to prepare

2 L

of its

0 .1 M

aqueous solution is:

The number of oxygen atoms in 4.4 g of CO2 is

Important Questions on Atoms and Molecules

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The number of oxygen atoms in $4.4 g$ of ${C O}_{2}$ is