# How many grams of F are in 335 g of CaF2?

## Question:

How many grams of F are in 335 g of CaF{eq}_2 {/eq}?

## Molar Mass:

The molar mass of a substance is a characteristic property of the substance which measures the mass per mole of the substance. We can derive the molar mass of a compound by summing the total masses of each element considering their stoichiometry.

Determine the mass of {eq}\displaystyle F {/eq} in the given mass of {eq}\displaystyle CaF_2 {/eq} by first finding the number of moles there is in the given amount, and then we multiply it to the molar ratio of {eq}\displaystyle F {/eq} per compound and then finally multiplying the molar mass of {eq}\displaystyle F {/eq}. The molar mass of {eq}\displaystyle CaF_2 {/eq} and {eq}\displaystyle F {/eq} are given as {eq}\displaystyle 78.07\ \rm{g/mol} {/eq} and {eq}\displaystyle 19.0 \rm{g/mol} {/eq}. We proceed with the solution.

{eq}\begin{align} \displaystyle 335\ g\ CaF_2\times \frac{1}{ 78.07}\rm{mol/g}\times \frac{2\ mol\ F}{1\ mol\ CaF_2}\times 19.0 \rm{g/mol} \approx 163\ g\ F \end{align} {/eq} 