# Each Macbook ordered this winter contains 6.87 * 10^23 lithium atoms in each battery. How do you convert the amount of atoms in each battery to moles of lithium atoms?

$6.87 \times {10}^{23}$ atoms Li make up $\text{1.14 mol Li}$.
One mole of an element contains $6.022 \times {10}^{23}$ atoms of the element. $\text{1 mol Li"=6.022xx10^23"atoms Li}$. In order to convert atoms to moles, divide the given number of atoms by $6.022 \times {10}^{23} \text{atoms/mol}$.
$6.87 \times {10}^{23} \cancel{\text{atoms Li"xx(1"mol Li")/(6.022xx10^23cancel"atoms Li")="1.14 mol Li}}$