Question

Calculate molecular mass of H2 and NH3 ( A+ mass of H=1 u,N=14u)

Answer 1

Explanation:

Hey,

molecular mass of H₂= 2× atomic mass of H

= 2×1 = 2 u.

molecular mass of O₂= 2× atomic mass of O

= 2 × 16u = 32 u.

molecular mass of Cl₂= 2 × atomic mass of Cl

= 2 × 35.5 u= 71 u.

molecular mass of CO₂= atomic mass of C + 2 × atomic mass of O

= 12 + 2×16

= 12+ 32= 44 u.

molecular mass of CH₄= atomic mass of C + 4 × atomic mass of H

= 12+ 4×1= 16 u.

molecular mass of C₂H₆= 2 × 12 + 6 × 1

= 30 u.

molecular mass of C₂H₄= 2 × 12 + 4 × 1

= 28 u.

molecular mass of NH₃= 14+ 3×1

= 17 u.

molecular mass of CH₃OH= 12 + 3× 1+ 16 × 1

= 32 u.