Question

Calculate the molecular masses of the following compounds :
(a) Hydrogen sulphide, H₂S
(b) Carbon disulphide, CS₂

(Atomic masses : H = 1 u ; S = 32 u ; C = 12 u)

Answer 1

(a) Given:
Atomic mass of H = 1 u
Atomic mass of S = 32 u
Therefore, molecular mass of H₂S can be calculated as follows:
(2 × 1) + (1 × 32) = 34
Hence, molecular mass of hydrogen sulphide is 34 u.

(b) Given:
Atomic mass of C = 12 u
Atomic mass of S = 32 u
Therefore, molecular mass of CS₂ can be calculated as follows:
(1 × 12) + (2 × 32) = 76
Hence, molecular mass of carbon disulphide is 76 u.