Question

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

Answer 1

Atomic mass of :-

H = 1u
O = 16u
C = 12u
N = 14u


So, molecular mass of :-

$H_{2}$ = 1 × 2 = 2u

$O_{2}$ = 16 × 2 = 32 u

$CO_{2}$ = 12 + 16 × 2 = 12 + 32 = 44 u

$CH_{4}$ = 12 + 1 × 4 = 12 + 4 = 16 u

$C_{2}H_{6}$ = 12 × 2 + 1 × 6 = 24 + 6 = 30 u

$C_{2}H_{4}$ = 12 × 2 + 1 × 4 = 24 + 4 = 28 u

$NH_{3}$ = 14 + 1 × 3 = 14 + 3 = 17 u

$CH_{3}OH$ = 12 + 1 × 3 + 16 + 1 = 12 + 3 + 17 = 32u