# Exactly 1 mol of C_2H_4O_2 contains how many moles of C,H, and O?

$2 \cdot m o l$, $4 \cdot m o l$, and $2 \cdot m o l$ of carbon, hydrogen, and oxygen atoms respectively.
And had the question asked how many $C , H , O$ atoms in a $\text{dozen}$ such molecules, I think you would have been able to answer $24$, $48$, and $24$ atoms respectively.
And the mole is simply a (much) larger number, $6.022 \times {10}^{23} \cdot m o {l}^{-} 1$, where 1 mole of $C$ specifies a mass of $12.01 \cdot g$. Capisce?