# How many grams are in 291 moles of arsenic?

About $22 \times {10}^{3} \cdot g$
The molar mass of arsenic is $74.92 \cdot g \cdot m o {l}^{-} 1$.
The mass of 291 moles is: $74.92 \cdot g \cdot m o {l}^{-} 1 \times 291 \cdot m o l$ $=$ ??*g.