# How many moles are in 25 grams of water?

Dec 30, 2015

$1.389 m o l$

#### Explanation:

Moles = Mass divided by molar mass, where molar mass of ${H}_{2} O$ is $1 + 1 + 16 = 18 g / m o l$.

$n = \frac{m}{{M}_{r}}$

$= \frac{25}{18}$

$= 1.389 m o l$.