# How many atoms are there in 2 moles of sodium?

There are $1.20 \cdot {10}^{24}$ atoms of sodium in $2$ moles of sodium.
One mole of a substance is defined by Avogadro as consisting of $6.022$x${10}^{23}$ atoms. This is Avogadro's number. To calculate the number of atoms in two moles of sodium, use dimensional analysis.
$2.0$ moles Na x $\frac{6.022 \cdot {10}^{23} g}{1 m o l} = 1.20 \cdot {10}^{24}$ atoms of Na.