Chemistry Nomenclature Practice Test - Prep, Study Guide & Practice Exam

The formula P4O10 indicates the composition of the compound clearly. In this molecular formula, the subscript next to the oxygen (O) denotes the number of oxygen atoms in the compound. The "10" after the oxygen symbol tells us that there are 10 oxygen atoms present in one molecule of this compound.

When interpreting chemical formulas, the subscript number signifies how many atoms of that element are included. Since in this case, we focus on the oxygen component, we see that it explicitly states there are 10 oxygen atoms. Understanding how to read chemical formulas is crucial in chemistry, as it helps in analyzing the composition of compounds. This foundational knowledge allows one to accurately determine the quantities of different elements within various chemical substances.