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The mineral hausmannite mass, in megagrams, which contains both manganese (II) and manganese (III) ions, is...

The mineral hausmannite mass, in megagrams, which contains both manganese (II) and manganese (III) ions, is formed from heating manganese (IV) oxide to 890 degrees Celsius. 3MnO2(l)--->Mn3O4(s) + O2(g)

a) what is the maximum mass, in megagrams, of Mn3O4 that can be formed form the decomposition of 31.85 Mg of manganese (IV) oxide, MnO2?

b) If 24.28 Mg of Mn3O4 is isolated in the decomposition reaction of 31.85 Mg of manganese (IV) oxide, MnO2, what is the percent yield?

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