The decomposition of nitrous oxide at 565 °C N20(g) → N2(g) + ½ O2(g) is second order in N20 with a rate constant of 2.20x10-2 M-1 s-1. If the initial concentration of N20 is 0.400 M, what will the concentration of N20 (in M, to three significant figures) remain after 25.0 seconds have passed.

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### Decomposition of Nitrous Oxide at 565 °C

**Reaction:**
\[ \text{N}_2\text{O(g)} \rightarrow \text{N}_2\text{(g)} + \frac{1}{2} \text{O}_2\text{(g)} \]

The reaction is **second order** in N₂O with a rate constant of \( 2.20 \times 10^{-2} \, \text{M}^{-1} \text{s}^{-1} \).

**Problem Statement:**
If the initial concentration of N₂O is 0.400 M, what will the concentration of N₂O (in M, to three significant figures) be after 25.0 seconds have passed?

---

**Solution Approach:**

To find the concentration of N₂O after 25.0 seconds for a second-order reaction, the formula used is:

\[
\frac{1}{[\text{N}_2\text{O}]_t} = \frac{1}{[\text{N}_2\text{O}]_0} + kt
\]

where:
- \([\text{N}_2\text{O}]_t\) is the concentration at time \( t \).
- \([\text{N}_2\text{O}]_0\) is the initial concentration (0.400 M).
- \( k \) is the rate constant \( (2.20 \times 10^{-2} \, \text{M}^{-1} \text{s}^{-1}) \).
- \( t \) is the time (25.0 s).

Please proceed by substituting the values and solving for \([\text{N}_2\text{O}]_t\).
Transcribed Image Text:### Decomposition of Nitrous Oxide at 565 °C **Reaction:** \[ \text{N}_2\text{O(g)} \rightarrow \text{N}_2\text{(g)} + \frac{1}{2} \text{O}_2\text{(g)} \] The reaction is **second order** in N₂O with a rate constant of \( 2.20 \times 10^{-2} \, \text{M}^{-1} \text{s}^{-1} \). **Problem Statement:** If the initial concentration of N₂O is 0.400 M, what will the concentration of N₂O (in M, to three significant figures) be after 25.0 seconds have passed? --- **Solution Approach:** To find the concentration of N₂O after 25.0 seconds for a second-order reaction, the formula used is: \[ \frac{1}{[\text{N}_2\text{O}]_t} = \frac{1}{[\text{N}_2\text{O}]_0} + kt \] where: - \([\text{N}_2\text{O}]_t\) is the concentration at time \( t \). - \([\text{N}_2\text{O}]_0\) is the initial concentration (0.400 M). - \( k \) is the rate constant \( (2.20 \times 10^{-2} \, \text{M}^{-1} \text{s}^{-1}) \). - \( t \) is the time (25.0 s). Please proceed by substituting the values and solving for \([\text{N}_2\text{O}]_t\).
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