How do you get the Molecular Formula from Percent Composition?
The simple answer is that you cannot do so. Elemental analysis does not lead to the molecular formula.
Get an organic sample, and combust it in a furnace, you can shunt the carbon dioxide and water gases to a gas chromatograph, and measure these quantities in relation to a standard. Percentage compositions with respect to
We use these percentages to calculate an EMPIRICAL FORMULA, which is the simplest whole number ratio that defines constituent atoms in a species. If we take simple organic (molecular) formula of
For larger organic molecules, say sugar,
There should be many examples on these boards of specific empirical/molecular formula calculations.