The concentration of cholesterol (C27H46O) in normal blood is approximately 0.005 M. How many grams of cholesterol are in 610 mL of blood?

Answer 1

0.005 M means 0.005 moles of substance in 1 L of solution.

In this case, the substance is cholesterol which has a molar mass of 387 g / mol

610 ml blood x 1 L / 1000 mls = 0.610 L

0.610 L x 0.005 mol / L = 0.00305 mols

0.00305 mols x 387 g / mol = 1.18 g = 1 g (1 sig. fig.)