# How do you find the number of molecules or ions of 6.022 mol O_2?

Feb 14, 2016

$6.022 \text{mol O"_2=3.626xx10^24"molecules O"_2}$

#### Explanation:

Since $\text{O"_2}$ is a molecular substance, you will determine the number of molecules in 6.022 mol $\text{O"_2}$.

Known

$\text{1 mol O"_2=6.022xx10^23 "molecules O"_2}$

Solution

Multiply the given moles of $\text{O"_2}$ times $6.022 \times {10}^{23} {\text{molecules O"_2"/mol O}}_{2}$.

$6.022 \cancel{\text{mol O"_2xx(6.022xx10^23"molecules O"_2)/(1cancel"mol O"_2)=3.626xx10^24"molecules O"_2}}$ (rounded to four significant figures)