Homework Help: chemistry (grade 12)

Posted by Rose Bud on Wednesday, February 15, 2012 at 3:20pm.

how much heat will be liberated if 37.8 g of Fe2O3 is allowed to react with 18.7 g of aluminum.

Fe2O3(s) + 2Al(s)--> Al2O3(s) + 2Fe(s) + 851.5kJ

chemistry (grade 12) - DrBob222, Wednesday, February 15, 2012 at 4:37pm
This is a combination limiting reagent problem with heat thrown in for good measure. What is the limiting reagent? How much Fe2O3 reacts?
851.5 kJ x (g Fe2O3 reacting/molar mass Fe2O3) = kJ heat released.
chemistry (grade 12) - Rose Bud, Wednesday, February 15, 2012 at 10:22pm
Thank you

I checked to see which one is the L.R, which it is Fe2O3, then i converted grams into moles and then converted those moles in to heat released and got -201.5 kJ

This is the first time i have been on here, if any one wants to confirm that is the correct answer, I would greatly appreciate it.

Thanks again

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