The chemical formula of refrigerant R11 is

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 11

By comparing with R - (m - 1) (n + 1) P

m – 1 = 0 ⇒ m = 1 i.e. 1 → Carbon atoms

n + 1 = 1 ⇒ n = 0 i.e. 0 → Hydrogen atoms

p = 1 i.e. 1 → Florine atom

Now

n + p + q = 2m + 2

⇒ 0 + 1 + q = 2 × 1 + 2

⇒ q = 3 i.e. 3 → Chlorine atoms

∴ C_mH_nF_pCl_q ⇒ CFCl₃

CF₃Cl

m = 1, n = 0, p = 3 and q = 1

n + p + q = 2m + 2

0 + 3 + 1 = 2 × 1 + 2

4 = 4 satisfied

R - (m - 1) (n + 1) P ⇒ R - 13

CHFCl

m = 1, n = 1, p = 1 and q = 1

n + p + q = 2m + 2

1 + 1 + 1 = 2 × 1 + 2

3 = 4 not satisfied

Not a Saturated Hydrocarbon

Unsaturated Hydrocarbon

R - 1150

By comparing with R - 1(m - 1) (n + 1) P

m – 1 = 1 ⇒ m = 2 i.e. 2 → Carbon atoms

n + 1 = 5 ⇒ n = 4 i.e. 4 → Hydrogen atoms

p = 0 i.e. 0 → Florine atom

n + p + q = 2m

⇒ 4 + 0 + q = 2 × 2

⇒ q = 0 i.e. 0 → Chlorine atoms

∴ C_mH_nF_pCl_q ⇒ C₂H₄

If refrigerant is Inorganic Compound

R – (Molecular Weight + 700)

NH₃ whose molecular weight is 17 and the chemical formula is R – 717

H₂0 whose molecular weight is 18 and the chemical formula is R – 718

CO₂ whose molecular weight is 44 and the chemical formula is R – 744