How many oxide ions are in 172 grams or Al2O3?

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answers:
pisgahchemist say: Al2O3 .....

Oxide ions in Al2O3??? the answer is "not really any." Despite being a network solid, aluminum oxide is not all that "ionic." Al-O bonds have about 56% ionic character (44% covalent character).

The question you are really asking is how many oxygen atoms are in 172g of aluminum oxide.

172g Al2O3 x (1 mol Al2O3 / 102.0g Al2O3) x (3 mol O / 1 mol Al2O3) x (6.022x10^23 atoms O / 1 mol O) = 3.05x10^24 atoms O
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Fern say: 172 grams Al2O3 x 1 mole Al2O3/102.0 grams = 1.69 moles Al2O3

Al2O3 ===⇒ 2Al3+ + 3O^2-
1.69 moles Al2O3 x 3 moles oxide/1mole Al2O3 = 5.07 moles oxide

5.07 moles oxide x 6.02 x 10^23 oxide ions/mole oxide = 3.05 x 10^24 oxide ions
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Dr W say: none. the atoms in Al2O3 are covalently bonded
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