Homework help! 2 questions

1) A 0.0125 mol sample of a metal combines with 0.200g of oxygen to produce a metal oxide. Determine the empirical formula of the metal oxide.

2) Manganese ions with the following charges are known: Mn2+, Mn3+ and Mn4+.
Knowing that the formula and ionic charge of an oxalate ion is C2O4 2-, write the chemical formula and name for the compound wherein each of these forms of manganese is combined with oxalate ion.


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Me = .0125 moles
O = .2 grams

Oxygen is 16 grams/mole
0.2(g) / 16(g/mol) = .0125 moles of Oxygen right?

moles of Me = moles of Oxygen
I think you catch my drift

Me - Metal atom if you were wondering

1)As scarf said, MeO.
2)Well, it could be
MnC2O4 when Mn2+
Mn2(C2O4)3 when Mn3+
Mn(C2O4)2 when Mn4+

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