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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chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.