Is the empirical formula
of a compound the same as the molecular formula? Click here
to find out for sure.
The molecular formula
for a compound gives the actual number of atoms
of each element present in a molecule. Therefore, in order to determine
formula from a compound's empirical
formula, the molar
mass of the compound must be known.
The molecular formula can be determined by multiplying each subscript
in the empirical formula by the number of empirical formula units. Let's take
a look at how to determine the molecular formula in the example below:
The molar mass of a compound containing only carbon and
hydrogen has a molar mass of 114.0 g/mole. Further analysis determined the empirical
formula of the compound to be C4H9. What is the molecular
formula for this compound?
Section 8.5 Calculation
of Empirical (Simplest) and Molecular Formulas..p200