# How many grams of Calcium are in 4.55 moles?

Well, in one mole of calcium there are $40.08 \cdot g$.
And in $4.55$ $\text{moles}$ of metal, there are $4.5 \cdot \cancel{m o l} \times 40.08 \cdot g \cdot \cancel{m o {l}^{-} 1}$ $\cong$ $180 \cdot g$.