Question

Would 1.000 g of oxygen be enough to completely react with the 1000.0 mg of
vitamin C

Answer 1

Liquid vitamin C, (ascorbic acid) C₆H₈O₆ , readily reacts with atmospheric oxygen, O₂, to form liquid dehydroascorbic acid, C₆H₆O₆ and water.

$2C_6H_8O_6 + O_2 \to 2C_6H_6O_6 + 2H_2O$

molar mass of vitamin C is many times of oxygen and the consumption of vitamin C is twice than that of oxygen as stochiometric coefficient of vitamin C is twice than that of oxygen

so oxygen is sufficient here and the limiting reagent is vitamin C