# How many molecules are in 5.35 moles of H_2O?

Apr 20, 2016

3.22×10^24 molecules ${H}_{2} O$

#### Explanation:

Avogadro's number states that every mole has
6.022⋅10^23 atoms (or molecules, depending on the substance).

So to figure this out you have to assume that 1 mol H_2O = 6.022×10^23

So set up a conversion.

$5.35 m o l$ ${H}_{2} O$ (6.022×10^23 molecules / 1 $m o l$)
$1 M o l$ cancels out with $m o l {H}_{2} O$.

5.35×6.022×10^23=3.22×10^24 molecules of ${H}_{2} O$