Posted by Zak on Sunday, March 28, 2010 at 10:09pm.
This is a limiting reagent problem. Most are solved the same way. However, this one has a short cut you can use.
Write an equation and balance it.
Convert 51 g Al2O3 to moles. moles = grams/molar mass.
Using the coefficients in the balanced equation, convert moles Al2O3 to moles Cr.
Now convert moles Cr to grams. g = moles x molar mass.
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