I believe that the balanced chemical reaction is:
C6H12O6 + 6 O2 → 6 CO2 + 6 H2O
So the number of grams of oxygen required is:
mass O2 required = 48 g C6H12O6 * (1 mole C6H12O6 / 180.16 g) * (6 mole O2 / 1 mole C6H12O6) * (32 grams O2 / 1 mole)
mass O2 required = 51.15 grams
