The gas phase decomposition of phosphine at 120 °C PH3(g)→1/4 P¾(g) + 3/2 H2(g) is first order in PH3. During one experiment it was found that when the initial concentration of PH3 was 2.64×10² M, the concentration of PH3 dropped to 3.72×103 M after 71 s had passed. Based on this experiment, the rate constant for the reaction is

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**The Gas Phase Decomposition of Phosphine at 120°C**

The chemical reaction for the gas phase decomposition of phosphine is as follows:

\[ \text{PH}_3(\text{g}) \rightarrow \frac{1}{4} \text{P}_4(\text{g}) + \frac{3}{2} \text{H}_2(\text{g}) \]

This reaction is first order with respect to PH₃.

**Experimental Data:**

During one experiment, it was observed that when the initial concentration of PH₃ was \(2.64 \times 10^{-2} \text{ M}\), the concentration dropped to \(3.72 \times 10^{-3} \text{ M}\) after 71 seconds.

Based on this experiment, the rate constant for the reaction is \(\_\_\_\_\) s\(^{-1}\).
Transcribed Image Text:**The Gas Phase Decomposition of Phosphine at 120°C** The chemical reaction for the gas phase decomposition of phosphine is as follows: \[ \text{PH}_3(\text{g}) \rightarrow \frac{1}{4} \text{P}_4(\text{g}) + \frac{3}{2} \text{H}_2(\text{g}) \] This reaction is first order with respect to PH₃. **Experimental Data:** During one experiment, it was observed that when the initial concentration of PH₃ was \(2.64 \times 10^{-2} \text{ M}\), the concentration dropped to \(3.72 \times 10^{-3} \text{ M}\) after 71 seconds. Based on this experiment, the rate constant for the reaction is \(\_\_\_\_\) s\(^{-1}\).
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