Question

The concentration of cholesterol (C22H460) in human blood is normally 0.005 M. How many grams
of cholesterol are present in 750 mL blood?​

Answer 1

Answer:

1.3635 grams  of cholesterol are present in 750 mL blood.

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.

Molarity of cholesterol in the human blood = 0.005 M

Volume of the blood = 750 ml = 0.750 L

Moles of cholesterol =  n

Molar mass of cholestrol = 22 × 12 g/mol + 4 × 1 g/mol+ 6 × 16 g/mol = 364 g/mol

$Molarity=\frac{moles}{\text {Volume in L}}$

$0.005 M=\frac{n}{0.750 L}$

n = 0.00375 mol

Mass of 0.00375 moles of cholesterol:

=0.00375 mol × 364 g/mol = 1.3635 g

1.3635 grams  of cholesterol are present in 750 mL blood.