AP Chemistry
5.3 Concentration Changes Over Time
A student studies the decomposition of hydrogen peroxide in an antimicrobial rinse at constant temperature. Under the experimental conditions, the reaction follows first-order kinetics.
\(2\text{H}_2\text{O}_2\text{(aq)} \rightarrow 2\text{H}_2\text{O(l)} + \text{O}_2\text{(g)}\)
What is the concentration of \(\text{H}_2\text{O}_2\text{(aq)}\) after \(42.0\text{ min}\)?
\(2\text{H}_2\text{O}_2\text{(aq)} \rightarrow 2\text{H}_2\text{O(l)} + \text{O}_2\text{(g)}\)
| Time (min) | \([\text{H}_2\text{O}_2]\) (M) |
|---|---|
| 0.0 | \(0.800\) |
| 14.0 | \(0.400\) |
What is the concentration of \(\text{H}_2\text{O}_2\text{(aq)}\) after \(42.0\text{ min}\)?
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