Question: how many moles of oxygen are there in one mole of c6h12o6?
Answer: glucose, so the mass of oxygen in 1 mole of glucose = 6 × 16.00 g = 96.00 g. % oxygen = 96.00 × 100 % = 53.3 % by mass. 180.18 [Note that the sum of the % of all the elements must add up to 100 %.]