When 2mol of C2H6 are burnt in 2mol of O2 the limiting reagent is C2H6 oxygen QUESTION 4 When 2mol of C2H6 are burnt in 8mol of O2 the limiting reagent is oxygen C2H6 QUESTION 5 When 120. g of C2H6 are burnt in 256g of O2 the limiting reagent is C2H6 oxygen