an impure sample of pyrolusite ore consist of 70 of mno2 20 inert impurities and rest moisture. On strong heating , all MnO2 is converted into MnO alongwith formation of O2 . The % of Mn in dried sample is (atomic mass of Mn = 55)
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An impure sample of pyrolusite ore consist of:
70% of mno2
20% inert impurities
10% moisture
When dried it will contain = 70/90 * 100 = 77.78% MnO2
Mass of Mn in one mole of MnO2 = 55g
Molar mass of MnO2 = 55 + 2x16 = 87
Percentage of Mn in MnO2 = 55/87 * 100 = 63.22%
Percentage of Mn in dried sample of pyrolusite = 63.22% x 77.78
= 49.17%
70% of mno2
20% inert impurities
10% moisture
When dried it will contain = 70/90 * 100 = 77.78% MnO2
Mass of Mn in one mole of MnO2 = 55g
Molar mass of MnO2 = 55 + 2x16 = 87
Percentage of Mn in MnO2 = 55/87 * 100 = 63.22%
Percentage of Mn in dried sample of pyrolusite = 63.22% x 77.78
= 49.17%
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Explanation:
Ag3A = 3Ag + A
3 moles of Ag combine with 3 moles of A
Mass of Ag = 0.37
Mass of A = 607 - 0.37 = 606.63
Moles of Ag = 0.37/108 = 0.003426
Moles of A = 0.003426/3 = 0.001142
Molar mass of A = 606.63/0.001142 = 531211
A tribasic acid has 3 atom of H
Molar mass of the acid = 3 + 531211 = 531214 g/mol
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