jee_main advance molecular formula and emperical formula

                 Molecular formula

The actual representation of various elements present in one molecule of a compount 

                  Emperical formula

The ratio of various elements persent in one molecule of a compount 

Molecular formula= mfEmperical formula= ef

 Mf= ef*n
n=mf mass/ef mass
Mf mass= 2vapour density
n is an intiger