Calculate the molecular masses of H2, O2, Cl2, CO2, CH4, C2H6, C2H4, NH3, CH3OH.
Molecular mass of H2 = 2x atomic mass of H
= 2 x 1 u = 2 u
Molecular mass of O2 = 2x atomic mass of O
= 2 x 16 u = 32 u
Molecular mass of Cl2 = 2x atomic mass of Cl
= 2 x 35.5 u = 71 u
Molecular mass of CO2 = atomic mass of C + 2 x atomic mass of O
= 12+ (2 x 16) = (12 + 32) u = 44 u
Molecular mass of CH4 = atomic mass of C + 4 x atomic mass of H
= 12 + (4 x 1) = (12 + 4) u = 16 u
Molecular mass of C2H6 = 2x atomic mass of C + 6 x atomic mass H
= (2 x 12 + 6 x 1)u = (24 + 6)u = 30 u
Molecular mass of C2H4 = 2x atomic mass of C + 4 x atomic mass of H
= (2 x 12 + 4 x 1) u = (24 + 4)u = 28 u
Molecular mass of NH3 = atomic mass of N + 3 x atomic mass of H
= (14 + 3 x 1)u = (14 + 3)u = 17u
Molecular mass of CH3OH = atomic mass of C + 3 x atomic mass of H + atomic mass of O + atomic mass of H
= (12 + 3 x 1 + 16 + 1)u = (12 + 3 + 17)u = 32 u