Question 1:

Calculate the molecular masses of H₂, O₂, Cl₂, CO₂, CH₄, C₂H₆, C₂H₄, NH₃, CH₃OH.

Answer:

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 × 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 + 4 × Atomic mass of H + Atomic mass of O

= 12 + 4 × 1 + 16 = 32 u

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