# Styrene has the empirical formula CH. It has a molar mass of 104 g. What is the multiplier to get the molecular formula?

May 6, 2016

The molecular formula is always a whole number multiple of the empirical formula. Of course, the multiple might be $1$.

#### Explanation:

Given what I have said:

("Empirical formula")xxn="Molecular formula"

$\left(C H\right) \times n = 104 \cdot g \cdot m o {l}^{-} 1$

$\left(12.01 + 1.01\right) \cdot g \cdot m o {l}^{-} 1 \times n = 104 \cdot g \cdot m o {l}^{-} 1$

Clearly, $n = 8$, and the molecular formula is ${C}_{8} {H}_{8}$.

Of course this is reasonable inasmuch that we know that the styrene monomer is ${C}_{6} {H}_{5} C H = C {H}_{2}$, i.e. vinyl benzene.