## Calculate the molecular masses of H 2 , O 2 , Cl 2 , CO 2 , CH 4 , C 2 H 6 , C 2 H 4 , NH 3 , CH 3 OH

Atomic mass of H =1 u

Atomic mass of O = 16 u

Atomic mass of Cl = 35.5 u

Atomic mass of C = 12u

Atomic mass of N= 14 u

Molecular mass of H 2 = 2 x Atomic mass of H

= 2 x 1u

= 2u

Molecular mass of O 2 = 2 x Atomic mass of O

= 2 x 16u

= 32u

Molecular mass of Cl 2 = 2 x Atomic mass of Cl

= 2 x 35.5u

= 71u

Molecular mass of CO 2 = 1x Atomic mass of C + 2 x Atomic mass of O

= 1 x 12u + 2x16u

= 12u+32u

= 48u

Molecular mass of CH 4 = 1x Atomic mass of C + 4 x Atomic mass of H

= 1 x 12u + 4x1u

= 12u+4u

= 16u

Molecular mass of C 2 H 6 = 2x Atomic mass of C + 6 x Atomic mass of H

= 2 x 12u + 6x1u

= 24u+6u

= 30u

Molecular mass of C 2 H 4 = 2x Atomic mass of C + 4 x Atomic mass of H

= 2 x 12u + 4x1u

= 24u+4u

= 28u

Molecular mass of NH 3 = 1x Atomic mass of N + 3 x Atomic mass of H

= 1 x 14u + 3x1u

= 14u+3u

= 17u

Molecular mass of CH 3 OH = 1x Atomic mass of C + 4 x Atomic mass of H + 1 x Atomic mass of O

= 1 x 12u + 4x1u + 1 x 16u

= 12u+4u+16u

= 32u

1. Class 9
2. Chapter 3 Class 9 - Atoms And Molecules (Term 2)
3. Questions from Inside the chapter

Questions from Inside the chapter

Class 9
Chapter 3 Class 9 - Atoms And Molecules (Term 2) 