Question

How many phosphorus atoms in a `0.0750*mol` quantity of `"hydroxyapatite"`?

Answer 1

Is not `"hydroxyapatite"`, `Ca_10(PO_4)_6(OH)_2`?

Explanation:

And of course in one formula unit, I read 6 phosphorus atoms, present as the phosphate.

SO in `0.0750*mol` of the stuff there are `0.0750*molxx6` `mol*P` atoms...........