 How many carbon dioxide molecules are needed to have 50.00 grams of carbon? So, mass of carbon, 50.00 grams of carbon. But we're looking for the number of molecules of carbon dioxide. So how would I do that? Turn this to moles. So the other thing you know about this is carbon dioxide is a carbon plus two oxygens. So you know that mole ratio there. So, carbon... Equation there. Molecules. And what else do I have to do? No. The number of molecules is what it's asking. So it's like... Yeah. Avogadro something, right? Give you the number of molecules of carbon dioxide? So you guys should be able to do that. So you're going to see more of these types of problems and less of those... And not the molecules of carbon. That's also the number of atoms of carbon. What I've done here, right? I've converted from moles of carbon to moles of carbon dioxide. So I've put that conversion there. But this type of problem? So again, there's going to be more of these types than the other ones.