Relationships between Molecular Formula and Empirical formula as follow
Molecular Formula = n x Empirical formula 
n = Molecular Formula/ Empirical formula
The   molecule  of  benzene  having  molecular  mass  as
78 µ.
Hence n = n= Molecular Formula  / Empirical formula  
                    =78µ/(12+1)µ
                    =78/13
                   =6
Molecular formula of benzene is 6 x (CH ) =C6H6
  Molecular Formula | 
  
  Empirical formula | 
 
| 
   
C2H6 
 | 
  
   
CH3 
 | 
 
| 
   
C2H4 
 | 
  
   
CH2 
 | 
 
| 
   
B2H6 
 | 
  
   
BH3 
 | 
 







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