# What are the empirical formulas for C9H20, P4O10, and B2H6?

Nov 12, 2015

${C}_{9} {H}_{20}$, ${P}_{2} {O}_{5}$ and $B {H}_{3}$.

#### Explanation:

To find the empirical formula from a molecular formula, you should divide the subscripts by the same integer in order to get the smallest whole numbers.

The empirical formula of ${C}_{9} {H}_{20}$ is ${C}_{9} {H}_{20}$ itself since there is no integer that we can find to divide $9$ and $20$ to get smaller whole numbers.

The empirical formula of ${P}_{4} {O}_{10}$ is ${P}_{2} {O}_{5}$. We get it by dividing both subscripts by $2$.

The empirical formula of ${B}_{2} {H}_{6}$ is $B {H}_{3}$. We get it by dividing both subscripts by $2$.