# What is the mass of .780 mol Ca(CN)_2?

One mole of calcium cyanide has a mass of 92.12 g. You have 0.780 mol of the stuff. So the mass is approx. $70$ $g$.
$0.780 \cdot \cancel{m o l} \times 92.12 \cdot g \cdot \cancel{m o {l}^{-} 1}$ $=$ ?? $g$