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First start with what you know to find the total moles.

Mn = 54.94g

O = 16g

54.94g * 2 = 109.88g

16 * 3 = 48g

Add these to get the weight of Mn2O3 which = 157.88

Divide 157.88 / 286 to get your total moles present, which = .552 Mols

To find moles Mn, divide 54.94 by the total weight which is 157.88. This gives you your moles Mn, which is .348 mols. Since you have Mn2, multiply that number by 2 to get .695 mols

Now you can divide Mol(Mn) by your total moles (.552) to get your moles Mn

So .695 mol Mn2O3 / .552 mol Mn = 1.1 Mol Mn

since 1.1 * 54.94 = 60 pct of the Molar Mass, this number makes sense since there is more Mn than O, the proportion seems correct.

hope this helped!

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