Homework Help: College Chemistry

Posted by Lance on Wednesday, April 4, 2012 at 12:18am.

A mixture of the compounds sodium oxide and magnesium chloride contains 2.4182 g of sodium oxide and is 89.3 % by mass magnesium chloride. The sodium oxide is 74.200 % by mass sodium. Calculate the moles of oxygen in the mixture.

Thanks in advance.

College Chemistry - DrBob222, Wednesday, April 4, 2012 at 12:31am
All of those numbers are meant to confuse you. You need only grams Na2O. The other numbers are useless.
2.4182 g Na2O/molar mass = mols Na2O
mols O = mols Na2O.
College Chemistry - Lance, Wednesday, April 4, 2012 at 12:37am
I knew something was fishy about this question. Thank you!

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