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 ( 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.

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.

The molecular mass of methane ( CH 4 ) is 16 u . . What is the mass of 5 × 6 . 022 × 10 23 CH 4 molecules?

The molar mass of methane ( CH 4 ) is = 16 g Number of methane molecules = 5 × 6 . 022 × 10 23 1 mole of methane molecules = 6 . 022 × 10 23 So, number of moles of methane = 5 × 6 . 022 × 10 23 6 . 022 × 10 23 = 5 Moles = 5 Molar mass of methane = 16 g Mass = moles × molar mass Mass of 5 moles of methane molecules = 5 × 16 = 80 g .

The chemical equation for the manufacture of ammonia is N 2 ( g ) + 3 H 2 ( g ) → 2 NH 3 ( g ) Complete the following: 1 mol N 2 + ____ H 2 → ____ NH 3

1 mol N 2 + 3 mol H 2 → 2 mol NH 3 The balanced chemical equation tells us that 1 mole of nitrogen reacts with 3 moles of hydrogen to produce 2 moles of ammonia.

The chemical equation for the manufacture of ammonia is N 2 ( g ) + 3 H 2 ( g ) → 2 NH 3 ( g ) Calculate the amount of H 2 required to react with 28 g of N 2 completely. [Molecular mass of N 2 = 28 u , H 2 = 2 u ]

The amount of H 2 required to react with 28 g of N 2 completely is: 28 g N 2 is equal to 1 mol N 2 1 mol of N 2 requires 3 mol of H 2 Hence, mass of H 2 = 3 × 2 g = 6 g

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)

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The number of moles present in $0.36 g$ of water.

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Important Questions on Atoms and Molecules

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: $Ca = 40 g, C = 12 g, O = 16 g$ ]

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

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

4 g

NaOH

is dissolved in water and the volume is made up to

1 L

.
(1 mole of

NaOH = 40 g

)
(a) Calculate the molarity of the resultant solution.
(b) How will you make

1 M

solution of

NaOH

using the same amount (

4 g

) of

NaOH

MEDIUM

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

Find how many moles of atoms are there in:

14 g of lithium.

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.

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

The molecular mass of methane $({CH}_{4})$ is $16 u .$ .

What is the mass of $5 \times 6.022 \times 10^{23} {CH}_{4}$ molecules?

MEDIUM

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

Find how many moles of atoms are there in:

40 g of calcium.

MEDIUM

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

Find how many moles of atoms are there in:

7 g of nitrogen.

EASY

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

Atomic mass of nitrogen is

14 u

. Which of the following sample contain

6.022 \times 10^{23}

nitrogen atoms?

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

Complete the following:

$1 mol N_{2} +____H_{2} \to____{NH}_{3}$

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

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

Calculate the amount of $H_{2}$ required to react with $28 g$ of $N_{2}$ completely.
[Molecular mass of $N_{2} = 28 u, H_{2} = 2 u$ ]

EASY

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

According to the following chemical equation:

$2 ZnS + 3 O_{2} \to 2 ZnO + 2 {SO}_{2}$

from 100 mole of $ZnS$

(i) how many gram of $ZnO$ , and

(ii) how many mole of ${SO}_{2}$ , will be produced ?
( $Zn = 65.5, S = 32, 0 = 16$ )

MEDIUM

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

The molecular mass of methane $({CH}_{4})$ is $16 u .$ .

Calculate the number of mole molecules in $160 g$ of ${CH}_{4}$ .

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

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

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

The number of moles present in 0.36 g of water.

Important Questions on Atoms and Molecules

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The number of moles present in $0.36 g$ of water.