Question

How many moles are in 216 g of aluminum?

Answer 1

The property that relates number of moles and mass of an atom is the atomic weight. For atoms, we can consult the atomic weight in a periodic table, for example.

Consulting the atomic weight of aluminium, we get:

`W_(Al)\approx26.98g/mol`

The relationship is as follows:

`W_(Al)=(m_(Al))/(n_(Al))`

Solving for n and substituting the given mass and the consulted atomic weight, we get:

`\begin{gathered} n_(Al)=(m_(Al))/(W_(Al)) \\ n_(Al)=(216g)/(26.98g/mol)\approx8.0mol \end{gathered}`

So, there is approximately 8 mol in 216 g of aluminium.