Question

Convert 345 moles of `"H"_2"O"` to molecules?

Answer 1

Using Avogadro's number, the total number of `"H"_2"O"` molecules is `2.08*10^26`.

Explanation:

Avogadro's number relates the total amount of atoms/molecules contained in a mole of some element/compound:

`"1 mol element" = 6.022*10^23 " atoms"`

OR

`"1 mol compound" = 6.022*10^23 " molecules"`

We can then use stoichiometry to calculate the total number of molecules:

`"345 mol H"_2"O" * (6.022*10^23 "molecules H"_2"O")/("1 mol H"_2"O") = 2.08 *10^26 " molecules H"_2"O"`