# What is the molar mass of of diazepam if 0.05570 mol has a mass of 15.86 g?

$\text{Molar mass}$ $=$ $\text{Mass"/"Molar quantity}$
$\text{Molar mass}$ $=$ $\text{Mass"/"Molar quantity}$
$=$ $\frac{15.86 \cdot g}{0.05570 \cdot m o l} = 284.7 \cdot g \cdot m o {l}^{-} 1$.