Question

H2CO3(aq) → H20 (aq) + CO2 (aq) He fills a reaction vessel with H,CO, and measures its concentration as the reaction proceeds. Here's a graph of his data: [H,C03](M) 40 6080 1 (seconds) Use this graph to answer the following questions: What is the half life of the reaction? '1/2 = Is Round your answer to 2 significant digits. 0. Suppose the rate of the reaction is known to be first order in H.CO. Calculate the value of the rate constant k. k = 0 x 6 ? Round your answer to 2 significant digits. Also be sure you include the correct unit symbol.

Answer 1

IS i Hay life of the reaction is the time required by the reaction to consume half of the intial amount of the reallant. In this case initial amount is 0.8M so the half life would be the time taken to consume 0.4M reactant which according to graph is 20 seconds. So the half life of the realtion is 20s. (ii) Rate Expression for pst order en (Ao ) = kt where As - insteal amount A = final amount karate constant J A = 0.8 and A= 0.4, then t=20s putting these values to time en/0.8 )= k. 20 7 en 2 = k k = 0.034 st Scanned with ~ 0.03 st CamScanner fiuta 1 10.4) 20