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If 120. grams of KClO3 reacts, how many grams of oxygen are produced?

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2KClO3 ==> 2KCl + 3O2
mols KClO3 = grams/molar mass.
Using the coefficients in the balanced equation, convert mols KClO3 to mols O2.
Now convert mols O2 to grams. g = mols O2 x molar mass O2 = ?

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