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78 gram sample of aluminum completely reacts with oxygen to form 6.67 grams of aluminum oxide. Use this data to calculate the mass percent...

A 4.78 gram sample of aluminum completely reacts with oxygen to form 6.67 grams of aluminum oxide. Use this data to calculate the mass percent composition of aluminum in aluminum oxide.
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4 Al + 3O2 → 2 Al2O3
Mass percentage Composition of
Aluminium in Aluminium oxide = x mass of Al2O3
= x 6.67 = x 6.67
= 1.76%

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