Chemistry help!?

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Determine the empirical formulas for each of the following compounds, using the information given.
5.00g of aluminum metal is burned in excess oxygen to produce 9.45g of aluminum oxide.

2007-09-25 09:30:15 · 1 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry

1 answers

9.45g Al-oxide - 5.00g Al = 4.45g Oxygen

Atomic weights: Al=27 O=16

5.00gAl/27 = 0.185

4.45gO/16 = 0.278

0.185/0.185 = 1.000

0.278/0.185 = 1.503

1.0:1.5 is 2:3, so the empirical formula is Al2O3

2007-09-25 09:38:49 · answer #1 · answered by steve_geo1 7 · 0⤊ 0⤋