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The subscript numbers in a chemical formula indicate the number of atoms of the element they follow. No subscript means 1 atom.

For example, H2O, or water, has 2 atoms and 1 atom of oxygen of hydrogen in each molecule. Or, in a more complex example a molecule of H2SO4, sulfuric acid, contains 2 hydrogen atoms, 1 sulfur atom, and 4 oxygen atoms.

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What is the order of atoms in the molecular formula of the compound?

The order of atoms in a molecular formula indicates the arrangement of different elements in a compound. The molecular formula provides information about the types and numbers of atoms present in a molecule.


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A molecular formula lists the numbers of the atoms of a specific element in a compound. A structural formula is a picture of how the atoms in a specific molecule are connected, with each atom represented by its chemical symbol. For example, oxygen's molecular formula is O2. Its structural formula is O-O.


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