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Igniting MnO(2) in air converts it quant...

Igniting `MnO_(2)` in air converts it quantitatively to `Mn_(3)O_(4)`. A sample of pyrolusite is of the following composition: `MnO_(2) = 80%`, `SiO_(2)` and other inert constituents = 15%, and rest bearing `H_(2) O`. The sample is ignited to constant weight. What is the percent of `Mn` in the ingnited sample?

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Inniting MnO_(2) in air converts it quantitctively to Mn_(3)O_(4) . A sample of pyrolusite is of the following composition. MnO_(2)=80% and othe inert constituents =15% and rest bearing H_(2)O . The sample is ignited to constant weight. What is the % of Mn is the igrited sample.

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