# 2.5 moles of water contains how many molecules??

Feb 1, 2018

$1.5 \times {10}^{24}$ molecules.

#### Explanation:

You can calculate the number of molecules from moles by using Avogadro's constant, $6.02 \times {10}^{23}$ $\text{molecules/mol}$.

For every $1$ mol, there are $6.02 \times {10}^{23}$ molecules.

Simply multiply

$\text{2.5 mol" xx (6.02 xx 10^23)/"1 mol} = 1.5 \times {10}^{24}$ $\text{molecules}$