CBSE - Chemistry - Atoms and Molecules

→ Molecular mass of H₂ = 2 × Atomic mass of H
= 2 × 1
= 2 u

→ Molecular mass of O₂ = 2 × Atomic mass of O
= 2 × 16
= 32 u

→ Molecular mass of Cl₂= 2 × Atomic mass of Cl
= 2 × 35.5
= 71 u

→ Molecular mass of CO₂= Atomic mass of C + 2 × Atomic mass of O
= 12 + 2 × 16
= 44 u

→ Molecular mass of CH₄ = Atomic mass of C + 4 × Atomic mass of H
= 12 + 4 × 1
= 16 u

→ Molecular mass of C₂H₆ = 2× Atomic mass of C + 6× Atomic mass of H
= 2 × 12 + 6 × 1
= 30 u

→ Molecular mass of C₂H₄= 2 x Atomic mass of C + 4 × Atomic mass of H
= 2 × 12 + 4 × 1
= 28 u

→ Molecular mass of NH₃ = Atomic mass of N + 3 × Atomic mass of H
= 14 + 3×1
= 17 u

→ Molecular mass of CH₃OH = Atomic mass of C + 3 × Atomic mass of H + Atomic mass of O + Atomic mass of H
= 12 + 3×1 + 8 + 1
= 24 u