# The molecular mass of octane is 14.22 g/mol. What is the mass of 22.05 mol of octane?

The molecular mass of octane is $114.23 \cdot g \cdot m o {l}^{-} 1$. So........
So if you have $22.05 \cdot m o l$ of this juice, there are $114.23 \cdot g \cdot \cancel{m o {l}^{-} 1} \times 22.05 \cdot \cancel{m o l} = 2519 \cdot g$, probably enuff to propel my motor for 30 km.