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

Oct 4, 2016

$0.39$ $\text{moles C}$
In every $\text{Avogadro's number, } {N}_{A}$ of carbon dioxide, there are ${N}_{A}$ carbon atoms, and $2 \times {N}_{A}$ oxygen atoms. And ${N}_{A}$ carbon dioxide molecules have a mass of approx. $44 \cdot g$.
If I asked, $\text{how many oxygen atoms in a dozen}$ $C {O}_{2}$ $\text{molecules?}$, would you be able to answer confidently? Because this is what the question in effect asks.