# How many moles are there in 24.0 grams of FeF_3?

Apr 7, 2017

0.213 moles

#### Explanation:

The number of moles in a substance = $\frac{M a s s}{R e l a t i v e M a s s}$

Mass = 24g

Relative Mass = 55.8 + 19 + 19 + 19 = 112.8 g/mol

$\frac{24}{112.8}$ = 0.2127659574 ≈ 0.213 moles

(I have rounded to 3 significant figures as the mass is)