Question

In `0.39*mol` `CO_2(g)`, how many moles of carbon are present?

Answer 1

`0.39` `"moles C"`

Explanation:

In every `"Avogadro's number, "N_A` of carbon dioxide, there are `N_A` carbon atoms, and `2xxN_A` oxygen atoms. And `N_A` carbon dioxide molecules have a mass of approx. `44*g`.

What is (i), the mass of the carbon in such a molar quantity; and (ii), the mass of the carbon dioxide in such a molar quantity?

If I asked, `"how many oxygen atoms in a dozen"` `CO_2` `"molecules?"`, would you be able to answer confidently? Because this is what the question in effect asks.