AP Chemistry
5.3 Concentration Changes Over Time
A student investigates the gas-phase decomposition of nitrogen dioxide at a constant temperature of \(500\text{ K}\) according to the following equation:
\[ 2\,\text{NO}_2\text{(g)} \rightarrow 2\,\text{NO(g)} + \text{O}_2\text{(g)} \]
The student measures the concentration of \(\text{NO}_2\text{(g)}\) at various times during the reaction and collects the data shown in the table below.
Which of the following claims is correct regarding the order of the reaction with respect to \(\text{NO}_2\), and provides the correct justification?
\[ 2\,\text{NO}_2\text{(g)} \rightarrow 2\,\text{NO(g)} + \text{O}_2\text{(g)} \]
The student measures the concentration of \(\text{NO}_2\text{(g)}\) at various times during the reaction and collects the data shown in the table below.
| Time (\(\text{s}\)) | \([\text{NO}_2]\) (\(\text{M}\)) |
|---|---|
| \(0\) | \(0.80\) |
| \(100\) | \(0.40\) |
| \(300\) | \(0.20\) |
| \(700\) | \(0.10\) |
Which of the following claims is correct regarding the order of the reaction with respect to \(\text{NO}_2\), and provides the correct justification?
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