Calculate the number of cholesterol (C27H46O) molecules in a 3.2mg cholesterol deposit in an artery

Question

Calculate the number of cholesterol (C27H46O) molecules in a 3.2mg cholesterol deposit in an artery.

Answer 1

The molar mass of cholesterol = 386.654 g/mol = 387 g/mole

3.2 mg cholesterol x 1 g/1000 mg x 1 mole/387 g x 6.02x10²³ molecules/mole = 5.0x10¹⁸ molecules.