Question

how many moles are in 2.11 x 1024 molecules of bef2? lets complete the conversion factor first. $\frac{1 mol bef_{2}}{? molecules of bef_{2}}$ 6.18 x 10^24 6.02 x 10^23 6.23 x 10^20

Explanation:

Step1: Recall Avogadro's number

1 mole of any substance contains $6.02\times 10^{23}$ particles (atoms, molecules, etc.). So for $BeF_2$, 1 mol $BeF_2$ contains $6.02\times 10^{23}$ molecules of $BeF_2$.

Answer:

$6.02\times 10^{23}$ molecules of $BeF_2$