# How many ATOMS in a 6*mol quantity of HCl(g)?

Well, we know that the $\text{Avogadro number} \equiv 6.022 \times {10}^{23} \cdot m o {l}^{-} 1 = {N}_{A}$
And so in 6 moles of $H C l \left(g\right)$ CLEARLY there are $12 {N}_{A}$ ATOMS, and here we use ${N}_{A}$ as we would any other collective number, $\text{dozens, grosses, 100's}$. There are 6 moles of hydrogen atoms, and 6 moles of chlorine atoms, bound together to form 6 moles of $H C l$ molecules.
We use such an absurdly large number because we KNOW that ${N}_{A}$ hydrogen, and ${N}_{A}$ chlorine atoms have masses of approx. $1 \cdot g$, and $35.5 \cdot g$ respectively. How did I know these numbers?