Answer: 3.4321229*10^23 molecules. Explanation: 1 mole of CBr4 contains 6.0221409*10^23 molecules (Avogadro's Number). The molar mass of this compound is 12.011 + 4(79.904) = 331.627 g. So the answer is (189/ 331.627) * 6.0221409*10^23 = 3.4321229*10^23 molecules.