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In a study of the gas phase decomposition of hydrogen iodide at 700 K HI(g)~1/2 H2(g) + 1/2 I2(g) the concentration of HI was followed as a function of time. It was found that a graph of 1/[HI] versus time in seconds gave a straight line with a slope of 1.74x10-3 M-1 5-1 and a y-intercept of 0.645 M-1. order in HI and the rate constant for the reaction is Based on this plot, the reaction is M-15-1 In a study of the rearrangement of cyclopropane to propene at 500 C (CH2)3*CH3CH=CH2 the concentration of (CH2)3 was followed as a function of time. It was found that a graph of In[(CH2)3] versus time in seconds gave a straight line with a slope of -8.91x10-4 5-1 and a y-intercept of -1.62 . Based on this plot, the reaction is order in (CH2)3 and the rate constant for the reaction is s-1 In a study of the rearrangement of cyclopropane to propene at 500 C (CH2)3>CH3CH=CH2 the concentration of (CH2)3 was followed as a function of time. It was found that a graph of In[(CH2)3] versus time in seconds gave a straight line with a slope of -1.05x10-3 s-1 and a y-intercept of -3.41 . v order in (CH2)3 and the half life for the reaction is Based on this plot, the reaction is seconds