# How many molecules are in a sample of water with a mass of 44.99 grams?

##### 1 Answer

Mar 5, 2016

#### Explanation:

To get the number of moles, we divide the mass by the molar mass:

Now by definition, in a mole of stuff there are

So, in the given quantity of water, there are

How many oxygen atoms in such a quantity; how many hydrogen atoms?