The empirical formula of a compound represents the simplest whole number ratio between the elements that make up the compound. This ten question practice test deals with finding empirical formulas of chemical compounds.

You may wish to review this topic before taking this test by reading the following:

Remember, the empirical formula is the smallest whole number ratio. For this reason, it's also called the simplest ratio. When you get a formula, check your answer to make sure the subscripts can't all be divided by any number (usually it's 2 or 3, if this applies). If you're finding a formula from experimental data, you probably won't get perfect whole number ratios. This is fine! However, it means you need to be careful when you're rounding numbers to make sure you get the correct answer. Real world chemistry is even trickier because atoms sometimes participate in unusual bonds, so empirical formulas aren't necessarily accurate.