How do you know the number of atoms in a compound?

How do you know the number of atoms in a compound?


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Most Helpful Guy

  • Add them up.
    Fe3-O2 (Iron Oxide, three Iron atoms, two Oxy)
    CH4 (One carbon, four hydrogen)

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Most Helpful Girl

  • Erm it depends on the compound. For example, water (H2O) has 3 atoms and salt (NaCl) has 2 atoms.

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    • Oh so do you just add them up? Like if there's Fe3Na so would there be 4 atoms?

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    • Asker is there a specific amount of a specific compound that you want to know the number of atoms of?

    • That science was too long ago for me anyway. I wouldn't attempt to figure that now. lol.

What Guys Said 2

  • Look up the atomical graph for said compound. There should be a sheet for general components.

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  • Use the Avogadro constant and the ratio of the atoms.

    https://en.wikipedia.org/wiki/Avogadro_constant

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What Girls Said 1

  • Count them

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    • Okay well lets say there's FeO how many atoms are in that?

    • You need a powerful microscope and a really small pointer. Then you count them all.

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