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Determine the empirical formula for each substance. A dead alkaline battery is found to contain a compund of Mn and O. Its analysis gives 69.6% Mn...

Determine the empirical formula for each substance.
1. A dead alkaline battery is found to contain a compund of Mn and O. Its analysis gives 69.6% Mn and 30.4% O.
2. A compound is 38.77% Cl and 61.23 %O.
3. Magnetic iron oxide is 72.4 % iron and 27.6% oxygen.

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