# What is the molar mass of cholesterol if 0.00105 mol

What is the molar mass of cholesterol if 0.00105 mol has a mass of 0.406 g?
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Jillian Edgerton
The molar mass of a substance M is defined as the mass (in grams) m per mole (n) of that substance. Place the mass in the numerator and the number of moles in the denominator and simplify
$M=\frac{m}{n}$
$=\frac{0.406g}{0.00105mol}$
$=387\frac{g}{mol}$

Marcus Herman
The number of moles of cholesterol is n=0.00105mol
The mass of cholesterol is m=0.406g
Let us calculate the molar mass of cholesterol.
$M=\frac{m}{n}$
$=\frac{0.406g}{0.00105mol}$
$=387\frac{g}{mol}$

nick1337

This is easy if you use a ratio and watch dimensional analysis words

$\frac{0.00105mol}{0.406gm}=\frac{1mole}{Xgms}$ Now cross multiply to get:

$\frac{0.00105mol}{Xgms}=\frac{0.406gms}{1mole}$

$Xgms=\frac{0.406gms}{0.00105mol}×1$

$\frac{0.406gms}{0.00105mol}=386.66\frac{gms}{mol}$ of cholesterol is what we want.