if 88.9g of scandium and 88.9g of oxygen react to give scandium oxide and a left over of oxygen 4.19g ,what percentage by mass of scandium oxide is the oxygen

Answer 1

I've tried to make sense of this problem and I've failed. I assume you want to know percent O in Sc2O3 but the figures don't come out anywhere even close. Is this a paper problem or is it a lab experiment. According to my calculations, if all of the Sc were used, you should have had about half of the oxygen left over. Perhaps I just don't understand what you want as an answer.