Question

What is the formula mass (molar mass) of cholesterol (C27H46O), a fat found in your blood and cell membranes? 19 g/mol 130 g/mol 260 g/mol 386 g/mol.

Answer 1

386.66 g/mol

Step-by-step explanation:

To calculate the molar mass of a molecule, you add up the molar masses of its atoms.

Thus, for cholesterol. we get

27C = 27 × 12.011 = 324.297 g

46H = 46 × 1.008 = 46.368

1O = 1 × 15.999 = 15.999

TOTAL = 386.655 g

To two decimal places, the molar mass of cholesterol is 386.66 g/mol