Find the ratio by

(a) CaCO₃

Atomic mass of Ca = 40 u

Atomic mass of C = 12 u

Atomic mass of O = 16 u

Thus, CaCO₃ = 40: 12: 16 × 3

= 40 : 12 : 48

Ratio by mass = 10 : 3 : 12

(b) MgCl₂:

Atomic mass of Mg = 24 u

Atomic mass of Cl = 35.5 u

Thus, the ratio by mass = Mg : Cl x 2

= 24 : 35.5 x 2

= 24 : 71

(c) H₂SO₄:

Atomic mass of H = 1 u

Atomic mass of S = 32 u

Atomic mass of O = 16 u

Thus, the ratio by mass = 2XH : S : 4XO

= 2 : 32 : 64

= 1 : 16 : 32