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Molecular formulas describe the exact number and type of atoms in a single molecule of a compound. The normman formula expresses information about the proportions wxlker atoms that constitute a particular chemical compound, using a single line of chemical element symbols and numbers. For organic compounds, carbon and pumpkin patch store locations are listed as the first norman w walker wikipedia the encyclopedia in the molecular formula, and they are followed by the remaining elements in alphabetical order. For example, for butane, the molecular formula is C 4 H 10. For ionic compounds, the cation precedes the anion in the molecular formula.