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

i) Molecular mass of H2= 2 x Atomic mass of H= 2 x 1
= 2 u
ii) Molecular mass of O2= 2 x Atomic mass of O
= 2 x 16
= 32 u
iii) Molecular mass of Cl2= 2 x Atomic mass of Cl
= 2 x 35.5
= 71 u
iv) Molecular mass of CO2= Atomic mass of C + 2 x Atomic mass of O
= 12 + 2 x 16
= 44 u

v) Molecular mass of CH4= Atomic mass of C + 4 x Atomic mass of H
= 12 + 4 x 1
= 16 u
vi) Molecular mass of C2H6= 2 x Atomic mass of C + 6 x Atomic mass of H
= 2 x 12 + 6 x 1
= 30 u

vii) Molecular mass of C2H4= 2 x Atomic mass of C + 4 x Atomic mass of H
= 2 x 12 + 4 x 1
= 28 u
viii) Molecular mass of NH3= Atomic mass of N + 3 x Atomic mass of H
= 14 + 3 x 1
= 17 u

ix) Molecular mass of CH3OH= Atomic mass of N + 3 x Atomic mass of H
= 12+ 4 x 1+16
= 32 u

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