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How many oxygen atoms are in AL2(CO3)3?

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Quick Answer

According to formulas posted by Crescent High School, there are nine oxygen atoms in a molecule of Al2(CO3)3, aluminum carbonate, because there are three sets of carbonate, CO3, ions. There are also two aluminum and three carbon atoms in total.

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Full Answer

To count the total number of atoms in a chemical formula, multiply each portion in parentheses by the subscript after it. By this method, Al2(CO3)3 is equivalent to Al2C3O9. If there is a coefficient, for example, in a chemical equation that must be balanced, the quantity of each atom is multiplied by this coefficient as well. For example, 2H2O, or two molecules of water, contains a total of four hydrogen and two oxygen atoms.

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