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How to Write the Formula for Iron (III) oxide

Learning to name chemical compounds requires that you:

  • Determine the type of compound you are working with.
  • Apply the rules for naming that type of compound.
  • Practice until it becomes second nature.
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Get more practice writing formulas for compounds.

For Iron (III) oxide use the hints and resources below to help write the formula.

Hint for Writing the Formula for Iron (III) oxide

With Iron (III) oxide the charge on Iron is +3 ... we can tell that from the (III).

  • Write the element symbol and ionic charge for both Iron and Oxygen(use the Periodic Table for Oxygen).
  • Modify the subscripts balance the charges so the overall charge on the compound is zero.
  • Use the criss-cross method to check your work.

Iron (III) oxide Resources