Help with chemistry/how to calculate percent yield?

So the question is: Sulfur and oxygen react to produce sulfur trioxide. In a particular experiment, the reaction of 5.0 grams of O2 and 6.0 grams of S can theoretically produce how many grams of SO3? I balanced the equation 2S+3O2 -> 2SO3 I also have the molar masses for the reactants but I m not sure how to... show more So the question is: Sulfur and oxygen react to produce sulfur trioxide. In a particular experiment, the reaction of 5.0 grams of O2 and 6.0 grams of S can theoretically produce how many grams of SO3?

I balanced the equation 2S+3O2 -> 2SO3
I also have the molar masses for the reactants but I m not sure how to set up the rest of the problem. I m not looking for someone to just give me the answer, but an explanation and steps would be really helpful! Thanks!
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