Question

A hydrocarbon contains 7.7% by mass of hydrogen and 92.3 by mass of carbon and the relative molecular mass is 78 derive the empirical formula of the compound and the molecular formula

Answer 1

Answer:

molecular mass = 78

Empirical Formula is

C= 92.3/12= 7.69

H= 7.68/1= 7.68

therefore Empirical formula is

CH

molecular formula is

(CH)n= 78

(12+1)n=78

n=78/13

n=6

molecular formula is

C6H6