how many grams of Aluminum Oxide is needed to completely react with 124g of Aluminum?

Question

4AL+3O2 =2AL2O3

Answer 1

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1.   Step 1. Find the mole-to-mole ratio between Al and Al₂O₃

From the chemical reaction I see that there are 4 Al/2 Al₂O₃

1. Step 2. Calculate moles of Al₂O₃

moles of Al₂O₃ = 124 g of Al *(1 mol of Al/ 26.98 g of Al) *(2 mol of Al₂O₃ /4 mol of Al = 2.29₈₀ mol of Al₂O₃

1. Step 3. Calculate mass of Al₂O₃

mass of Al₂O₃ = 2.29₈₀ mol of Al₂O₃ * 101.96 g of Al₂O₃/1 mol of Al₂O₃ = 234 g of Al₂O₃

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