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1aa3-2012-tut4-a - CHEMISTRY 1AA3 Week of TUTORIAL PROBLEM...

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CHEMISTRY 1AA3 Week of JANUARY 30, 2012 TUTORIAL PROBLEM SET 4 QUESTIONS ______________________________________________________________________________ Page 1 of 5 1. The rate law for the reaction: F 2 (g) + 2 ClO 2 (g) 2 FClO 2 (g) is rate = k [F 2 ][ClO 2 ]. At 25 C, the rate constant for the reaction is 1.2 M 1 s 1 . Calculate the rate of the reaction at 25 C if [F 2 ] = 0.010 M and [ClO 2 ] = 0.020 M. SOLUTION: rate = k [F 2 ][ClO 2 ] and k = 1.2 M 1 s 1 rate = (1.2 M 1 s 1 )(0.010 M)(0.020 M) rate = 2.4 10 4 M/s 2. Can you convert a second order reaction into a pseudo-first order reaction? a. Give an example: SOLUTION: Ester hydrolysis is the example used in class. It involves the stchiometric reaction between an ester molecule and a water molecule. Additional examples are hydrolysis of analogous hydrolysable functional groups such as amides, anhydrides, , as well as all reactions between nucleophiles (water, hydroxide, amines, thiols ) and electrophiles (esters, anhydrides, primary (unhindered alkylhalides that undergo SN2 reactions). b. Explain the difference between a true 1st order, and a pseudo-1st-order, reaction. SOLUTION: A true first order reaction would be the substitution of a sterically hindered, tertiary alkyl chloride such as the t BuCl discussed in class, with nucleophiles. Here, the kinetics (rate of reaction) is determined by the initial slow step of alkylhalide decomposition into the intermediate cation and the chloride anion.
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