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| Experiment. No. | Initial [NO] (M) | Initial [Cl2] (M) | Initial rate of disappearance of Cl2 (M/min) |
| 1 | 0.15 | 0.15 | 0.60 |
| 2 | 0.15 | 0.30 | 1.20 |
| 3 | 0.30 | 0.15 | 2.40 |
| 4 | 0.25 | 0.25 | ? |
| [N2O5](M) | Time (min) |
| 0.400 | 0.00 |
| 0.289 | 20.0 |
| 0.209 | 40.0 |
| 0.151 | 60.0 |
| 0.109 | 80.0 |
$\log{k}=14.2-\frac{\text{1.0}\times\text{10}^{4}}{\text{T}}K$
Calculate Ea for this reaction and rate constant k if its half-life period be 200 minutes.
(Given: R = 8.314 J K–1 mol–1)