empirical vs. molecular formula

empirical

derived from or guided by direct experience or by experiment, rather than abstract principles or theory:
Empirical evidence of changes in kelp consumption was gathered by measuring the bite marks in seaweed fronds.
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depending upon experience or observation alone, without using scientific method or theory, and hence sometimes insufficiently authoritative, especially as in medicine:
That is nothing but an empirical conclusion with no regard for the laws of thermodynamics.
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provable or verifiable by experience or experiment, as scientific laws:
Theoretical physics is criticized for producing complex concepts that are mathematical, not empirical.

Chemistry.

a chemical formula that indicates the kinds of atoms and the number of each kind in a molecule of a compound.