Given the balanced equation, #2SO_2 + O_2 -> 2SO_3# , what is the molar ratio of #O_2# to #SO_3#? Chemistry Stoichiometry Mole Ratios 2 Answers David G. May 1, 2016 One mole of #O_2# will produce two moles of #SO_3#, so the mole ratio is 1:2. Answer link Edmund Liew May 1, 2016 If one mole of #O_2# gives you 2 moles of #SO_3#, then the mole ratio between #O_2 : SO_3# is 1 : 2 Answer link Related questions Question #a106e Question #e2e86 Question #a1072 Question #c5bf1 Question #dc373 Question #c5bf9 Question #a1076 Question #dc377 Question #b984f Question #19ea3 See all questions in Mole Ratios Impact of this question 4620 views around the world You can reuse this answer Creative Commons License