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posted by K Tuesday, January 11, 2011 at 3:09am.

The grams of oxygen that would produce 13.4 g Cl^2O^7 molecules.

The fraction of a Cl2O7 molecule's mass that is oxygen is (16*7)/[16*7 + 2*35.5) = 112/183 = 0.612 Multiply that by 13.4 g for the answer.

Thank you.

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