AP Chemistry
4.5 Stoichiometry
4.3 Representations of Reactions
A student investigates the reaction between gaseous nitrogen monoxide and oxygen to form nitrogen dioxide, represented by the balanced equation below.
\[ 2\,\text{NO(g)} + \text{O}_2\text{(g)} \rightarrow 2\,\text{NO}_2\text{(g)} \]
The student constructs particulate representations for the initial and final states of four different trials conducted in separate rigid \(1.0\text{ L}\) containers. The particle counts recorded from the student's representations are summarized in the table below.
Assuming each reaction proceeds to completion, which trial's particulate model correctly represents the final mixture while obeying the law of conservation of mass?
\[ 2\,\text{NO(g)} + \text{O}_2\text{(g)} \rightarrow 2\,\text{NO}_2\text{(g)} \]
The student constructs particulate representations for the initial and final states of four different trials conducted in separate rigid \(1.0\text{ L}\) containers. The particle counts recorded from the student's representations are summarized in the table below.
| Trial | Initial \(\text{NO}\) particles | Initial \(\text{O}_2\) particles | Final \(\text{NO}\) particles | Final \(\text{O}_2\) particles | Final \(\text{NO}_2\) particles |
|---|---|---|---|---|---|
| 1 | \(6\) | \(2\) | \(0\) | \(0\) | \(4\) |
| 2 | \(4\) | \(4\) | \(0\) | \(2\) | \(2\) |
| 3 | \(6\) | \(4\) | \(2\) | \(1\) | \(4\) |
| 4 | \(8\) | \(3\) | \(2\) | \(0\) | \(6\) |
Assuming each reaction proceeds to completion, which trial's particulate model correctly represents the final mixture while obeying the law of conservation of mass?
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