
To find:
The curves that represent [N2O] and [O2] in Figure P13.1.

Answer to Problem 13.1VP
Solution:
a) The green line represents [N2O]
b) The red line represents [O2]
Explanation of Solution
1) Concept:
The concentration of a reactant reduces with time as more and more of it reacts to produce the product(s). So, the line that represents the concentration of the reactant N2O will curve downward with increasing time. This corresponds to the green line.
Conversely, the concentration of a product increases with time as more of it is produced. There are two lines which show increasing concentrations with time. These represent concentrations of the two products - N2 and O2. To decide which one represents [O2], we must look at the stoichiometry of the balanced reaction equation. For every two moles of N2O that reacts, an equal number of moles of N2 are produced, and half that number, 1 mole of O2 is produced. This means the increase in concentration of O2 will be slower than the increase in concentration of N2 by a factor of two. Therefore, it is the red line that must represent [O2].
Conclusion:
The lines that represent [N2O] and [O2] in the given figure can be determined from how they change over time.
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Chapter 13 Solutions
Chemistry: An Atoms-Focused Approach
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