Question

How many moles are in 500 grams of CO?

Answer 1

Using the relation between mass and the molar mass you can find the amount of substance:
\[\Large n=\frac{ m }{ M }\]
Here is \(n\) the amount of substance, \(m\) the mass and \(M\) the molar mass, which is the sum of each elemental in the specie, in this case CO:
\[M(CO)=M(C)+M(O)\]
You can find the mass of each elemental in your periodic table.