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- One of two or more substances that have the same molecular formulaThe chemical formula of a substance written using the subscripts that reflect the number of each kind of atom present in a molecule of the substance. For example, the simplest formula for ethane is CH3, but the molecular formula is C2H6 because there are 2 C atoms and 6 H atoms in a molecule of ethane. (are composed of elements in the same proportion and have the same molar massThe mass of a mole of substance; the same as molecular weight for molecular substances.), but differ in some aspect of structure.