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MnO(2) on ignition converts into Mn(3)O(...

`MnO_(2)` on ignition converts into `Mn_(3)O_(4)`. A sample of pyrolusite having 75% `MnO_(2)`, 20% inert impurities and rest water is ignited in air to constant mass. What is the percentage of Mn in the ignited sample ?

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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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