Question

Calculate the molecular mass of the following : (a) Chlorine gas (b) Ammonia gas (c) Sulphur trioxide gas (Given atomic mass of Cl35.5 u, N14 u, H1u, S32 u, O16 u)

Answer 1

a)
Chlorine gas
Cl2 = 2 * 35.5 = 71 u

b)
Ammonia gas
NH3 = 14 + 3*1 = 17 u

c)
Sulphur trioxide gas
SO3 = 32 + 3*16 = 80 u