An oxide of aluminum contains 0.545 g of Al and 0.485 g of O. Find the empirical formula
for the oxide.

The answer is: Al2O3

Explanation:

The data they give us is:

To find the empirical formula without knowing the grams of the compound, we find it per mole:

Then we must divide the results obtained by the lowest result, which in this case is 0.02:

Since both numbers have to give an integer, multiply by 2 until both remain integers:

Now the answer is given correctly:

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