First determine the molar mass (mass of one mole) of glucose, which is 180.15588 g/mol . Next divide the given mass of glucose by its molar mass. 300 g C 6 H 12 O 6 × 1 mol C 6 H 12 O 6 180.15588 g C 6 H 12 O 6 = 2 mol C 6 H 12 O 6 ( 1.7 rounded to one significant figure)