Concept explainers
Interpretation:
H2 reacts with O2 and produced water vapors. The molecular picture of product and the left-over reactant needs to be determined.
Concept Introduction:
The reaction in which the reactant is totally consumed when the reaction is completed is
known as limiting reactant.
Answer to Problem 7STP
The left-over reactant is O2 molecules.
Explanation of Solution
The given reaction is shown below:
The balanced
H2 molecule represented as follows:
O2 molecules represented as follows:
The molecular picture is shown below:
As
According to the balanced reaction; 1 molecule of H2 reacts with ½ molecule of O2 and produces 1 molecule of H2O. In the given picture there are 6 molecules of H2 are present and 6 molecules of O2 are present. Therefore; 6 molecules of H2 reacts with 3 molecules of O2 but there are 6 molecules of O2 present. So, H2 act as a limiting reactant. Hence, 6 molecules of H2 will react with 3 molecules of O2 and will produce 6 molecule of water and the remaining 3 molecules of oxygen will be present as they don’t react.
Therefore; the left-over reactant is O2.
The molecular picture is shown below:
The left-over reactant is O2 molecules
Chapter 9 Solutions
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