Find the empirical formula and the molecular formula of an organic compound

Organic Chemistry (10)

Find the empirical formula and the molecular formula of an organic compound from the data given below:

C = 75.92%, H = 6.32% and N = 17.76%

The vapour density of the compound is 39.5. [C = 12, H = 1, N = 14]

Answer

 

Empirical formula is: C₅H₅N

Empirical formula weight = 60 + 5 + 14 = 79

n = molecular weight / empirical formula weight

= (2 × 39.5)/79 = 1

Molecular formula = C₅H₅N

• Exam Year: 2019