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Fill in the blank with the correct number to balance the equation: 4Al + O2 → 2Al2O3. (Enter only a whole number.)

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Okay1465

Answer:

3

Explanation:

You have to balance the atoms. On the right side there are 6 oxygen. In order to get the other side even you need a 3 coeficcient to get 6 oxygen on the left. That is the best way I can explain it.

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