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Enhance your chemistry knowledge with our comprehensive guide to Chemistry Formulas and Chemical equations with extramarks study material Chemical formulae provide a way to represent any chemical substance using the symbol of the elements present in it. Provided below is a list of the chemical formulas of some common chemical compounds (along with their molecular weights). Learn the definition, types and examples of chemical formulas, and find a comprehensive list of chemical compounds and their formulas. Chemical formulas show the types and numbers of atoms in a molecule using elemental symbols and subscripts. Learn what a chemical formula is and how to write different types of formulas for compounds. See examples of empirical, molecular, condensed, and structural formulas for butane and other molecules.