A 2.760 g sample of carbon was burned, yielding 10.120g of carbon dioxide. How many grams of oxygen was taken up by the reaction? What ofrmula would I use to solve this problem?

Answer 1

C + O2 ==> CO2
Convert 10.120 g CO2 to mols.
Convert mols CO2 to mols O2.
Convert mols O2 to grams O2.
Post your work if you get stuck.
(As it turns out, the 2.760 g C was apparently pure C so the same process could have been used with the 2.760 g C but the problem doesn't say pure C so the SURE way is to do it the way I outlined.)