Question

How many atoms are in a molecule of feldspar?

Answer 1

Let's look at some formulas for feldspar molecules.


`KAlSi_3O_8`

`NaAlSi_3O_8`

`CaAl_2Si_2O_8`

In each of these you should notice that besides there being 8 oxygen atoms, the total number of atoms adds up to 13. (if an element has only 1 atom the number is just left off)