Question

Calculate the molecular masses of the following: 

(a) Hydrogen, H₂ 

(b) Oxygen, O₂ 

(c) Chlorine, Cl 

(d) Ammonia, NH₃ 

(e) Carbon dioxide, CO₂ 

(Atomic masses: C =12u; H= 1u; O = 16u; Cl = 35.5u; N = 14u )

Answer 1

(a).Molecular mass of Hydrogen (H₂) = 2 x H = 2 x 1 u = 2 u

(b).Molecular mass of oxygen (O₂) = 2 x O = 2 x 16 u = 32 u 

(c).Molecular mass of chlorine (Cl₂) = 2 x Cl = 2 x 35.5 = 71 u 

(d).Molecular mass of Ammonia (NH₃) = 1 x N + 3 x H = 14 + 3 = 17 u 

(e).Molecular mass of carbon dioxide (CO₂) = 1 x C + 2 x O = 12 + 32 = 44 u