Chromium metal can be produced from the high temperature reaction of Cr2O3 with

Question

Chromium metal can be produced from the high temperature reaction of Cr2O3 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 337.0g of chromium metal by the first reaction. Calculate the number of grams of silicon requires to prepare 337.0 g of chromium metal by the second reaction.
Chromium metal can be produced from the high temperature reaction of Cr2O3 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 337.0g of chromium metal by the first reaction. Calculate the number of grams of silicon requires to prepare 337.0 g of chromium metal by the second reaction.
Cr2O3+2Al—> 2Cr + Al2O3 2Cr2O3+ 3Si—> 4Cr + 3SiO2 Calculate the number of grams of aluminum required to prepare 337.0g of chromium metal by the first reaction. Calculate the number of grams of silicon requires to prepare 337.0 g of chromium metal by the second reaction.

Explanation / Answer

1.

Moles of Cr = mass of Cr / molar mass of Cr = 337.0 / 52 = 6.48 mol

From the balanced equation,

2 mol of Cr is formed from 2 mol Al

SO, moles of Al required to prepare 337.0 g. of Cr = 6.48 mol

Mass ofAl required = moles * molar mass = 6.48 * 27.0 = 175. g.

2.

From the balanced equation,

4 mol of Cr is formed from 3 mol of Si

Then, 6.48 mol of Cr is fromed from 6.48 * 3 / 4 = 4.86 mol of Si

Mass of Si required = moles * molar mass = 4.86 * 28.1 = 136.6 g.

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