Question

Calculate the molecular mass of- Nh3 , Co2, HCl , Cl2

Answer 1

NH3 = atomic mass of N + 3(atomic mass of H)
= 14 + 3(1)
= 17 amu

Co2 = atomic mass of c + 2(atomic mass of o)
= 12 +2(16)
= 44 amu

HCl = atomic mass of H + atomic mass of Cl
= 1 + 35.5
= 36.5 amu

Cl2 = 2(atomic mass of Cl)
= 2 × 35.5
= 70 amu

Answer 2

Hi !

NH₃ [ Ammonia ]
Molar mass of Nitrogen = 14 u 
Molar mass of Hydrogen = 1 u

Molecular mass of NH₃ = 1 × 14 + 3×1 = 17u
=================================================

CO₂ [ Carbon dioxide]

Molar mass of Carbon = 12 u 
Molar mass of Oxygen = 16 u

Molecular mass of CO₂ = 1 × 12 + 2 ×16 = 44 u
==================================================

HCl [ Hydrochloric acid ]

Molar mass of Hydrogen = 1 u 
Molar mass of Chlorine = 35.5 u

Molecular mass of HCl = 1 × 1+ 1 ×35.5 = 36.5 u
=========================================.

Cl₂ [ chlorine gas ]

Molar mass of Chlorine = 35.5 u

Molecular mass of HCl = 2 ×35.5 = 71 u