# What is the empirical formula for the compound P4O6?

The empirical formula for $\text{P"_4"O"_6}$ is $\text{P"_2"O"_3}$.
The empirical formula of a compound is the lowest whole number ratio of elements in the compound. To find the empirical formula for the compound $\text{P"_4"O"_6}$, divide the subscripts (which represent the ratio) by 2 to get $\text{P"_2"O"_3}$. This ratio cannot be further reduced as whole numbers.