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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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To solve the problem step-by-step, we will first analyze the composition of the pyrolusite sample and then calculate the percentage of manganese (Mn) in the ignited sample. ### Step 1: Determine the composition of the sample The sample contains: - MnO₂ = 80% - SiO₂ and other inert constituents = 15% - H₂O = 5% (since the total must equal 100%) ...
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