Question

1. Calculate the molecular masses
of H, 0, C1, CO, CH, CH.
CH, NH, CH,OH.
C​

Answer 1

Answer:

i) Molecular mass of H2= 2 x Atomic mass of H = 2 x 1  

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 C + 4 x Atomic mass of H + 1 x Atomic mass of O = 12 + 4 x 1 + 16 = 32 u

Explanation: