Question

In a `0.25*mol` quantity of `BaCO_3`, how many moles of oxygen atoms are present?

Answer 1

If there were a 1 mol quantity of `BaCO_3`, clearly there would be 3 mol of oxygen atoms present. The question specifies a 0.25 mol quantity of `BaCO_3`, so we have 0.75 mol oxygen atoms .

Explanation:

If we have 0.25 mol `BaCO_3`, clearly there are 0.25 mol Ba atoms, and 0.75 mol oxygen atoms, because for every mol of Ba, there must be 3 mol oxygen atoms, and 1 mol carbon. Please note that I quote the answer in oxygen atoms , and not oxygen molecules, i.e. `O_2` species.