Question

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

Answer 1

i) H2
= 2 × H
= 2 × 1
= 2u
ii) O2
= 2 × O
= 2 × 16
= 32u
iii) Cl2
= 2 × Cl
= 2 × 35.5
= 71u
iv) CO2
= 1 × 12 + 2 × O
= 1 × 12 + 2 × 16
= 12 + 32
= 44u
v) CH4
= 1 × 12 + 4 × 1
= 12 + 4
= 16u
vi) C2H6
= 2 × 12 + 6 × 1
= 24 + 6
= 30u
vii) C2H4
= 2 × 12 + 4 × 1
= 24 + 4
= 28u
viii) NH3
= 14 × 1 + 3 × 1
= 14 + 3
= 17u
ix) CH3OH
= 12 × 1 + 3 × 1 + 16 × 1 + 1 × 1
= 12 + 3 + 16 + 1
= 32u