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MOLE CONCEPT Q: MnO2 on ignition converts into Mn3O4.A pyrolusite having 75% MnO2 ,20% inert impurities and rest water is ignited in air to a constant weight. what is the percentage of Mn in the ignited sample?
apply POAC Mn atomlet there be 100g mixturethen wtg. of Mn= 75g now, inert impurities =20g and xg Mn3O4 is formed MnO2 = Mn3O4for Mn atom 75/87 =3x/229( M.W. of MnO2 = 87, M.W. of Mn3O4 =229)then x=65.8wt of mn in product = (75/87) * 55=47.41g%tage of Mnin product = 47.41/(65.8+20) * 100=55.26%
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