HI(g)½ H2(g) + ½ I2(g) the following data were obtained: [HI], M 0.573 0.287 0.144 7.20×10-2 seconds 0 520 781 912 Hint: It is not necessary to graph these data. (1) The observed half life for this reaction when the starting concentration is 0.573 M is s and when the starting concentration is 0.287 M is s. (2) The average rate of disappearance of HI from t = 0 s to t = 520 s is  M s-1. (3) The average rate of disappearance of HI from t = 520 s to t = 781 s is  M s-1.

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