# What is the mass of 7.50 moles of sulfur dloxide (SO_2)?

Well, sulfur dioxide has a molar mass $64.07 \cdot g \cdot m o {l}^{-} 1$......
And to get the mass of $7.5 \cdot m o l$ we simply multiply $\text{number of moles}$ $\times$ $\text{molar mass}$, i.e.
7.50*cancel(mol)xx64.07*g*cancel(mol^-1)=??g