Tuesday
September 2, 2014

Homework Help: Chemistry

Posted by Anonymous on Wednesday, April 7, 2010 at 5:30pm.

In a reaction, 39.5 g of chromium(III) oxide reacts with 14.0 g of aluminum to produce chromium and aluminum oxide. If 27.0 g of chromium is produced, what mass of aluminum oxide is produced?

I don't know where to begin. Do I put this into a chemical formula? balance it out?
like,
2 CR2O3 + 3Al --> 4 Cr + 3 AlO2??

In the book it said something about ratios, but I have no clue how to do that. Please help explain this, much appreciated!

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