# How many grams of calcium are in 7.0 moles?

Well, there are $40.08 \cdot g$ calcium in $1 \cdot m o l$ of metal.
And $40.08 \cdot g \cdot \cancel{m o {l}^{-} 1} \times 7.0 \cdot \cancel{m o l}$ $\cong$ $280 \cdot g$.