
Interpretation:
The mole ratio used to calculate the number of moles of oxygen gas required to react completely with a given number of moles of aluminum metal needs to be determined.
Also, the mole ratio used to calculate the number of moles of the product expected if a given number of moles of aluminum metal reacts completely needs to be determined.
Concept Introduction:
The mole ratio should use to calculate how many moles of oxygen gas would be needed to react completely with a given number of moles of aluminum metal is (3 mol O2 / 4 mol Al).

Answer to Problem 6A
The mole ratio of Al : O2 = 4 : 3
The mole of the limiting reactant to the product = 4:2 or 2:1
Use the mole coefficient of Al since it is completely consumed in the reaction and is thus the limiting reactant.
Therefore, use the mole ratio of Al:Al2O3
Explanation of Solution
The mole ratio should use to calculate how many moles of oxygen gas would be needed to react completely with a given number of moles of aluminum metal is (3 mol O2 / 4 mol Al).
Here, 4 mol Al is used because it is stated in the balanced chemical equation that 4 moles Al react with 3 moles of O2. So, put 4 moles Al in the denominator so that the units will cancel with the given value and mol O2 will be left.
The mole ratio uses to calculate the number of moles of product that would be expected if a given number of moles of aluminum metal reacts completely is (2 mol Al2O3 / 4 mol Al).
Here, used 4 mol Al because it is stated in the balanced chemical equation that 4 moles Al is needed to produce 2 mol Al2O3.
So, put the 4 mol Al in the denominator so that the units will cancel with the given and mol Al2O3 will be left as shown below:
Chapter 9 Solutions
World of Chemistry, 3rd edition
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