Complete the table given below by finding out the chemical formula and molecular mass. (Atomic mass : H = 1 , O = 16 , N = 14 ) Element /Compound Chemical formula Molecular mass Hydrogen H 2 1 + 1 = 2 Oxygen O 2 _____ Nitrogen N 2 _____ Water H 2 O 1 + 1 + 16 Ammonia NH 3 _____

Completed table is: (Atomic mass : H = 1 , O = 16 , N = 14 ) The molecular mass of a substance is the sum of the average masses of the atoms in one molecule of a substance. Element /Compound Chemical formula Molecular mass Hydrogen H 2 1 + 1 = 2 Oxygen O 2 16 + 16 = 32 Nitrogen N 2 14 + 14 = 28 Water H 2 O 1 + 1 + 16 Ammonia NH 3 14 + 3 1 = 14 + 3 = 17

What is the relation between the mass of elements and compounds and the number of molecules present in them? Analyse the table given below and complete it. Element / Compound Molecular mass Mass in grams GMM No. of molecules Hydrogen H 2 2 2 g 1 GMM 6 . 022 × 10 23 H 2 molecules Oxygen O 2 32 32 g 1 GMM 6 . 022 × 10 23 O 2 molecules Nitrogen N 2 28 28 g _____ _____ Water H 2 O 18 18 g 1 GMM 6 . 022 × 10 23 H 2 O molecules Ammonia NH 3 17 17 g _____ _____

Mass of elements and compounds contains Avogadro number of molecules. Therefore, completed table is: Element / Compound Molecular mass Mass in grams GMM No. of molecules Hydrogen H 2 2 2 g 1 GMM 6 . 022 × 10 23 H 2 molecules Oxygen O 2 32 32 g 1 GMM 6 . 022 × 10 23 O 2 molecules Nitrogen N 2 28 28 g 1 GMM 6 . 022 × 10 23 N 2 molecules Water H 2 O 18 18 g 1 GMM 6 . 022 × 10 23 H 2 O molecules Ammonia NH 3 17 17 g 1 GMM 6 . 022 × 10 23 NH 3 molecules

MEDIUM

10th Kerala Board

IMPORTANT

Earn 100

How many atoms are present in $12 g$ carbon?

Important Questions on Gas Laws and Mole Concept

MEDIUM

10th Kerala Board

IMPORTANT

Chemistry Standard X Part 1>Chapter 2 - Gas Laws and Mole Concept>Exercise

A carbon atom combines with two oxygen atoms. If so, how many oxygen atoms are needed for combining with

6.022 \times 10^{23}

carbon atoms?
What will be the mass of these atoms?

MEDIUM

10th Kerala Board

IMPORTANT

Chemistry Standard X Part 1>Chapter 2 - Gas Laws and Mole Concept>Exercise

How many GAM is present in

69 g

of sodium? How many atoms are present in it.

HARD

10th Kerala Board

IMPORTANT

Chemistry Standard X Part 1>Chapter 2 - Gas Laws and Mole Concept>Exercise

How many GAMs is present the $42 g$ of nitrogen? Calculate the number of atoms present in the sample? (Atomic mass of $N = 14$ )

MEDIUM

10th Kerala Board

IMPORTANT

Chemistry Standard X Part 1>Chapter 2 - Gas Laws and Mole Concept>Exercise

How many GAMs is present the

80 g

oxygen. Calculate the number of atoms present in the sample? (Atomic mass of

O = 16

)

MEDIUM

10th Kerala Board

IMPORTANT

Chemistry Standard X Part 1>Chapter 2 - Gas Laws and Mole Concept>Exercise

Complete the table given below by finding out the chemical formula and molecular mass.

(Atomic mass : $H = 1, O = 16, N = 14$ )

Element /Compound	Chemical formula	Molecular mass
Hydrogen	$H_{2}$	$1 + 1 = 2$
Oxygen	$O_{2}$	_____
Nitrogen	$N_{2}$	_____
Water	$H_{2} O$	$1 + 1 + 16$
Ammonia	${NH}_{3}$	_____

HARD

10th Kerala Board

IMPORTANT

Chemistry Standard X Part 1>Chapter 2 - Gas Laws and Mole Concept>Exercise

Calculate the molecular mass of glucose

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

and sulphuric acid

(H_{2} {SO}_{4})

. (Atomic mass

C = 12, H = 1, O = 16, S = 32

)

EASY

10th Kerala Board

IMPORTANT

Chemistry Standard X Part 1>Chapter 2 - Gas Laws and Mole Concept>Exercise

What is the relation between the mass of elements and compounds and the number of molecules present in them? Analyse the table given below and complete it.

Element / Compound	Molecular mass	Mass in grams	GMM	No. of molecules
Hydrogen $(H_{2})$	$2$	$2 g$	$1 GMM$	$6.022 \times 10^{23} H_{2}$ molecules
Oxygen $(O_{2})$	$32$	$32 g$	$1 GMM$	$6.022 \times 10^{23} O_{2}$ molecules
Nitrogen $(N_{2})$	$28$	$28 g$	_____	_____
Water $(H_{2} O)$	$18$	$18 g$	$1 GMM$	$6.022 \times 10^{23} H_{2} O$ molecules
Ammonia $({NH}_{3})$	$17$	$17 g$	_____	_____

MEDIUM

10th Kerala Board

IMPORTANT

Chemistry Standard X Part 1>Chapter 2 - Gas Laws and Mole Concept>Exercise

What is the molecular mass of oxygen?

How many atoms are present in 12 g carbon?

Important Questions on Gas Laws and Mole Concept

Learn and Prepare for any exam you want !

How many atoms are present in $12 g$ carbon?