Question

Calculate the molecular masses of the following compounds
(i) Hydrogen sulphide, H2S
(ii) Carbon disulphide, CS2
(Atomic masses H = 1 u; S = 32 u; C = 12 u)

Answer 1

Explanation:

Atomic mass of hydrogen = 1 a.m.u. Atomic mass of Sulphur = 32 a.m.u. Thus, the molecular mass of hydrogen sulphide, which contains two atoms of hydrogen and one atom of sulphur is = 2 × 1 + 1 × 32 = 34 a.m.u.

.CS2=64+12=76

Answer 2

Answer:

Atomic mass of hydrogen(H)= 1amu

Atomic mass of sulphur (S)= 32

Atomic mass of Hydrogen sulphide(H2S)=2×1+32=34

Atomic mass of Carbon=12

Atomic mass of Carbon disulphide, CS2=16+2×32=80