A 542.3g sample of Manganese oxide has a Mn : O ratio of 1.0 : 1.42, consists of braunite (Mn_2 0_3);...... Manganosite (MnO) What masses of braunite; manganosite are in the ore? What is the ratio...

A 542.3g sample of Manganese oxide has a Mn : O ratio of 1.0 : 1.42, consists of braunite (Mn_2 0_3);...

... Manganosite (MnO) What masses of braunite; manganosite are in the ore? What is the ratio of Mn^+3 Mn^+2 in the ore?

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llltkl | College Teacher | (Level 3) Valedictorian

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Let w be the wt. of braunite, then wt. of manganosite is (542.3-w) 

By atom balance and extracting Mn:O, we get

(542.3-w + 2w)/ (542.3-w + 3w) = 1:1.42

wherefrom one gets w = 392.7 g and (542.3 - w) = 149.6 g

Now amount of Mn3+ is 110*392.7/155 = 278.7 g

and amount of Mn2+ is 55*149.6/71 = 115.9 g

Ratio of Mn3+ to Mn2+ will be 278.7:115.9 = 12:5

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