Writing Errands

SO3 can be produced in the following two-step process: FeS2 + O2 —> Fe2O3 + SO2 S02 + O2 —-> SO3 Assuming that all the FeS2 reacts, how many grams of SO3 are produced when 20.0 g of the FeS2 reacts with 16.0 g of O2?

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