# How do you calculate the number of grams in 11.3 moles?

$\text{The mole}$ is simply a collective number, like a $\text{dozen}$, or a $\text{Bakers' dozen}$, or a $\text{gross}$. One mole of stuff specifies ${N}_{A}$, $\text{Avogadro's number}$, individual items of stuff, where ${N}_{A} = 6.022 \times {10}^{23} \cdot m o {l}^{-} 1$.
So we know we've got $11.3 \times {N}_{A}$ pieces of stuff. We need to know the molar mass of the stuff BEFORE we calculate the mass. If it's hydrogen atoms, we know we've got about $11.3 \cdot g$, if it's carbon, we know we've got about $11.3 \times 12 \cdot g$. Anway, it's over to you.