If a sample of carbon dioxide, #CO_2#, contains #3.8# moles of oxygen, how many moles of #CO_2# make up the sample? Chemistry The Mole Concept The Mole 1 Answer David G. May 9, 2016 Each mole of #CO_2# contains 2 moles of oxygen, so there are half as many moles of #CO_2# as there are moles of oxygen: #1.9# #mol#. Answer link Related questions How do you calculate the number of moles from volume? How do you convert grams to mole? Question #258e5 Question #8d48c Why is the mole an important unit to chemists? What's the mole number? How does the mole relate to carbon 12? How does the mole relate to molecules and ions? How do you calculate the moles of a substance? How can I calculate the moles of a solute? See all questions in The Mole Impact of this question 11391 views around the world You can reuse this answer Creative Commons License