Problem: Chromium metal can be produced from the high temperature reaction of Cr 2O3 [chromium(III) oxide] with silicon or aluminum by each of the following reactions: Cr2O3 + 2Al → 2Cr + Al2O3 2Cr2O3 + 3Si →  4Cr + 3SiO2 Calculate the number of grams of aluminum required to prepare 133 g of chromium metal by the first reaction. Calculate the number of grams of silicon required to prepare 133 g of chromium metal by the second reaction.

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Problem Details

Chromium metal can be produced from the high temperature reaction of Cr 2O3 [chromium(III) oxide] with silicon or aluminum by each of the following reactions: 

Cr2O3 + 2Al → 2Cr + Al2O3 

2Cr2O3 + 3Si →  4Cr + 3SiO2 

Calculate the number of grams of aluminum required to prepare 133 g of chromium metal by the first reaction. 

Calculate the number of grams of silicon required to prepare 133 g of chromium metal by the second reaction.


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