# What is the total mass of 0.75 mol of SO_2?

Well, one mole of sulfur dioxide has a mass of $64.07 \cdot g$
So, if there are $0.75 \cdot m o l$, the mass is $0.75 \cdot \cancel{m o l} \times 64.07 \cdot g \cdot \cancel{m o {l}^{-} 1} \cong 48 \cdot g$.
What is the mass of $\frac{1}{2} \cdot m o l$ of stuff?