# What is the empirical formula of a compound made up of 80% oxygen and 20% hydrogen?

Jul 28, 2017

I think you will need to check your sources.......

#### Explanation:

We assume a $100 \cdot g$ mass of compound, and we interrogate its atomic composition by dividing thru by the ATOMIC masses of each constituent.....

$\text{Moles of oxygen} = \frac{80.0 \cdot g}{15.999 \cdot g \cdot m o {l}^{-} 1} = 5.00 \cdot m o l$

$\text{Moles of hydrogen} = \frac{20.0 \cdot g}{1.00794 \cdot g \cdot m o {l}^{-} 1} = 20.00 \cdot m o l$

We divide thru by the LOWEST molar quantity to give and empirical formula of.....

${H}_{4} O$.....

This is not a valid chemical formula.....and I would check your source.