# How many moles are there in 3.00 g of ethanol, CH_3CH_2OH?

$\text{Moles"="Mass"/"Molar Mass}$
$\text{Moles}$ $=$ $\frac{3.00 \cdot g}{46.07 \cdot g \cdot m o {l}^{-} 1}$ $\cong$ $7.0 \times {10}^{-} 2 \cdot m o l$.