or
or
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
750 ml blood x 1 L / 1000 ml = 0.75 L
0.75 L x 0.005 mol / L = 0.00375 mols
0.00375 mols x 387 g / mol = 1.45125 g = 1.4 g ( sig. fig.)
