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Relationship between empirical and molecular formula:

Relationship between empirical and molecular formula:
Molecular formula = n x Empirical formula
  • Molecular formula is integral multiple of empirical formula.
  • Where, ‘n’ is a simple integer.
  • The value of n is the ratio of molecular mass and empirical formula mass.
n = 
(i) The value of n is greater than one for all those compounds which have different empirical formula and molecular formula. Molecular formula is simple multiple of empirical formula. e.g. n = 6 and n = 2 for benzene and acetic acid respectively.
(ii) The value of n is unity for all those compounds which have same empirical and molecular formula. e.g. n = 1 for water (H2O) and sucrose (C12H22O11).

Difference between molecular formula and empirical formula 

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