Empirical formula of organic compound

 Empirical Formula of Organic Compounds

-The empirical formula of an organic compound (any substance that contains carbon) can be found by.

-Burning the compound (reaching it with O₂)

-Collecting and weighing the products

-From the mass of the products, the mole of each element in the organic compound can be calculated.

 

Example

    
What is the empirical formula of a compound that when a 500 gram sample is produces 15.0 grams of CO₂ and 8.18 grams of H₂O ?

-Step1: Find mole of CO₂ and H₂O

              mol CO₂ = 15.0g x 1mol/44.0g = 0.341mol   0.341mol/0.341mol = 1

              mol H₂O = 8018g x 1mol/18.0g = 0.454mol

              0.454 x 2 = 0.908899mol/0.341mole=2.66 2.66 x 3 = 8
Answer:C₃H₈