The chemical formula of aluminum oxide is: ( mathrm{AlO} ) ( mathrm{Al}_{3} mathrm{O}_{2} ) ( mathrm{Al}_{2} mathrm{O}_{3} ) ( mathrm{AlO}_{2} )
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To balance these charges, we need 2 aluminum atoms and 3 oxygen atoms. Show more…
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Aluminum oxide is an ionic compound. Sketch the transfer of electrons from aluminum atoms to oxygen atoms that accounts for the chemical formula of the compound $\mathrm{Al}_{2} \mathrm{O}_{3}$.
Sapphire is aluminium oxide. Aluminium oxide crystallizes with aluminium ions in two-third of the octahedral voids in the closest packed array of oxide ions. What is the formula of aluminium oxide? (a) $\mathrm{Al}_{2} \mathrm{O}_{3}$ (b) $\mathrm{AlO}_{2}$ (c) $\mathrm{Al}_{3} \mathrm{O}_{4}$ (d) $\mathrm{Al}_{3} \mathrm{O}_{2}$
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Exercises I
Aluminum reacts with oxygen to give aluminum oxide. $$4 \mathrm{Al}(\mathrm{s})+3 \mathrm{O}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{Al}_{2} \mathrm{O}_{3(\mathrm{~s})$$ If you have $6.0 \mathrm{~mol} \mathrm{Al},$ calculate the amount (mol) and mass (g) of $\mathrm{O}_{2}$ needed for complete reaction. Calculate the mass of $\mathrm{Al}_{2} \mathrm{O}_{3},$ in grams, that is produced.
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