# How many moles are in 7.744 grams of cobalt?

A bit of a $\frac{1}{10}$ of a mole.
$\text{Number of moles}$ $=$ $\text{Mass"/"Molar Mass}$
$=$ $\frac{7.744 \cdot \cancel{g}}{58.93 \cdot \cancel{g} \cdot m o {l}^{-} 1}$ $=$ ??mol