A chemistry graduate student is studying the rate of this reaction: 2HI (g) → H2 (g) +I½ (g) He fills a reaction vessel with HI and measures its concentration as the reaction proceeds: time [HI] (seconds) 0 0.500 M 0.10 0.222 M 0.20 0.143 M 0.30 0.105 M 0.40 0.0835 M Use this data to answer the following questions. Write the rate law for this reaction. rate = k Calculate the value of the rate constant k. k = U Round your answer to 2 significant digits. Also be sure your answer has the correct unit symbol.

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