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MnO2 on ignition converts into Mn3O4. A sample of pyrolusite having 75% MnO2,20%inert impurities and rest water is ignited in air to constant weight. What is the percentage of Mn in the ignited sample
sivaji
apply POAC Mn atom
let there be 100g mixture
then wtg. of Mn= 75g now, inert impurities =20g and xg Mn3O4 is formed
MnO2 = Mn3O4
for Mn atom 75/87 =3x/229 ( M.W. of MnO2 = 87, M.W. of Mn3O4 =229)
then x=65.8
wt of mn in product = (75/87) * 55=47.41g
%tage of Mn in product = 47.41/(65.8+20) * 100=55.26%
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