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molecular formula:see formulaformula,
in chemistry, an expression showing the chemical composition of a compound. Formulas of compounds are used in writing the equations (see chemical equations) that represent chemical reactions. Compounds are combinations in fixed proportions of the chemical elements.
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molecular formula[mə′lek·yə·lər ′fȯr·myə·lə]
A chemical formula that indicates the actual numbers and kinds of atoms in a molecule, but not the chemical structure.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
a chemical formula indicating the numbers and types of atoms in a molecule
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005