Calculate the molecular mass of- NH3, CO2, HCl, Cl2

We need to find the molecular mass of the given compounds

(i) NH3

Molecular mass of NH3= Atomic mass of N + 3 x Atomic mass of H

Molecular mass ofNitrogen = 14

Molecular mass of hydrogem= 1
= 14 + 3 x 1
= 17 g

(ii) CO2

Molecular mass ofCO2= Molecular mass of carbon + 2 (Molecular mass of oxygen) { 2 atoms of oxygen are present)

Molecular mass of carbon = 12

Molecular mass of oxygen= 16

molecular mass of CO2 = 12 + (16 X 2)

= 12 + 32

= 44 g

(iii) HCl

Molar mass of hydrochloric acid

Molecular mass of Hydrogen = 1

Molecular mass of chlorine= 35.5

= 1 + 35.5 = 36.5 g

(iv) Cl2

Molar mass of Cl2 = 35.5

Molecular mass of Cl2= 2 x Atomic mass of Cl
= 2 x 35.5
= 71g

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