# Dariana Deducing a rate law from the change in concentration over time A chemistry graduate student is studying the rate of this reaction: H2CO, (ag) H20 (ag)+Co, (ag) She fills a reaction vessel with HCO2 and measures its concentration as the reaction proceeds: H,Co3] time minutes) 0 0.800 M 10. 0.377 M 20. 0.246 M 30 0.183 M 40. 0.146 M Use this data to answer the following questions. rate k Write the rate law for this reaction. Calculate the value of the rate constant k. ? X Round your answer to 2 significant digits. Also be sure your answer has the correct unit symbol. Dariana Using an integrated rate law for a first-order reaction Consider this reaction 2HI (g)H (g)+I, (e) At a certain temperature it obeys this rate law. rate (0.00981 s[HI] Suppose a vessel contains HI at a concentration of 0.460 M. Calculate the concentration of HI in the vessel 65.0 seconds later. You may assume no other reaction is important. Round your answer to 2 significant digits ? X

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