For each molecule of propane (c3h8) that burns, three molecules of carbon dioxide are produced (3co2). how many total oxygen atoms are in those molecules?

Given the criteria, there are six because there are three Carbon dioxide molecules and di means two; so two times three us six. But if u look at the whole reaction *pictured below* u will see that in the entire reaction there are 10 Oxygen reacting through the whole thing.
*the triangle is the Greek letter delta and it symbolizes heat in a reaction.

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