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The formula for aluminum oxide is Al2O3, which means that, if aluminum oxide is ionically bonded, every formula mass of aluminum oxide contains three O-2 ions. In this instance, 0.65 formula masses of aluminum oxide would contain 3 X 0.65 or 1.95 moles of O2-.

If aluminum oxide were covalently bonded, it would not contain any O-2 ions.

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Q: How many moles of O2- ions are in 0.65 moles of aluminum oxide?
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How many moles of aluminum ions are in 45.0 g of aluminum oxide?

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