Chemical formula for ‘R22’ refrigerant:

Concept:

where m = No. of Carbon atoms, n = No. of Hydrogen atoms, p = No. of Florine atoms, q = No. of Chlorine atoms

Calculations:

Given:

R 22

By comparing with ⇒  R - (m - 1) (n + 1) p

m – 1 = 0 ⇒ m = 1 ⇒  1 → Carbon atoms

n + 1 = 2 ⇒ n = 1 ⇒  1 → Hydrogen atoms

p = 2 ⇒  2 → Florine atom

Now,

(n + p + q) = (2m + 2)

(1 + 2 + q) = (2 × 1) + 2

q = 1 ⇒ 1 → Chlorine atoms

∴ Chemical formula  ⇒  CmHnFpClq  ⇒  CHClF₂

This is the chemical formula of Monochloro difluoro methane.