How many molecules are in 720 grams of C6H12O6?

The gram molecular mass of C6H12O6 is 180.16, Which can be found from summing 6 times the gram Atomic Mass of carbon, 12 times the gram atomic mass of hydrogen, and 6 times the gram atomic mass of oxygen. Therefore, by the definition and value of Avogadro's Number, the number of molecules of C6H12O6 in 720 grams of the substance is (720/180.16) X Avogadro's Number, or 2.41 X 1024 molecules, to the justified number of significant digits.