Question

2.5 moles of water contains how many molecules??

Answer 1

`1.5 xx 10^24` molecules.

Explanation:

You can calculate the number of molecules from moles by using Avogadro's constant, `6.02 xx 10^23` `"molecules/mol"`.

For every `1` mol, there are `6.02 xx 10^23` molecules.

Simply multiply

`"2.5 mol" xx (6.02 xx 10^23)/"1 mol" = 1.5 xx 10^24` `"molecules"`