Question

What is the empirical formula of the following ?
i) Fructose (C₆H₁₂O₆) found in honey
ii) Caffeine (C₈H₁₀N₄O₂) a substance found in tea and coffee.

Answer 1

(i). Chemical formula of the Fructose = C₆H₁₂O₆

Now, We can see that the whole number 6 is the multiple of the given chemical formula.

Now, 
Molecular Formula = n  × Empirical Formula,
C₆H₁₂O₆ = 6 × Empirical Formula
∴ Empirical Formula = CH₂O


(ii). Chemical Formula of the Caffeine = C₈H₁₀N₄O₂

The highest multiples of the given chemical formula is 2.
∴ n = 2

∴ Molecular Formula = n  × Empirical Formula,
C₈H₁₀N₄O₂ = 2 × Empirical Formula.
∴ Empirical Formula = C₄H₅N₂O.


Hope it helps.

Answer 2

Answer:

Empirical formula of c6h12o6 = ch2o

Empirical formula of c8h10n4o2= c4h5n2o