# What is the molar mass of cholesterol if 0.00105 mol weighs 0.406g?

We require the, ratio $\text{Mass of stuff"/"Molar quantity of stuff}$.
And thus (0.406*g)/(1.05xx!0^-3*mol) $\cong$ $400 \cdot g \cdot m o {l}^{-} 1$