# How many atoms of lithium are there in 3.45 moles?

Mar 10, 2016

$\text{3.45 moles Li}$ contains $2.08 \times {10}^{24} \text{atoms}$.

#### Explanation:

The relationship between atoms and moles is:

$1 \text{mole atoms"=6.022xx10^23 "atoms}$

In order to determine how many atoms occupy a given number of moles, multiply the given moles by $6.022 \times {10}^{23} \text{atoms/mole}$.

In the case of 3.45 moles lithium (Li):

$3.45 \cancel{\text{mol Li"xx(6.022xx10^23"atoms Li")/(1cancel"mol Li")=2.08xx10^24 "atoms Li}}$ rounded to three significant figures