The compound 1,3-butadiene (C₄H₆) forms 1,5-cyclooctadiene, C₈H₁₂ at higher temperatures C₄H₆(g) → 1⁄2 C₈H₁₂(g). Use the following data to determine the order of the reaction and the rate constant, k. (Note that the total pressure is the pressure of the unreacted C₄H₆ at any time plus the pressure of the C₈H₁₂.)

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Time (min) 0 3.5 11.5 18.3 25.0 32.0 41.2 Total Pressure (mm Hg) 436 428 413 401 391 382 371