kinetics homework

kinetics homework - Calculate the rate constant and give...

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CE 3230 Kinetics Homework (Problems 1-4 are from Snoeyink and Jenkins, 1980) 1. A first-order reaction is 40 percent complete at the end of 50 minutes. What is the value of the rate constant in sec -1 ? In how many minutes will the reaction be 80 percent complete? 1.70 x 10 -4 sec -1 and 157 min 2. If the initial rate of a second-order reaction a 20ºC is 5 x 10 -7 moles/liter/sec, and the initial concentrations of the two reacting substances are each 0.2 M, what is k in liters/mole/sec? If the activation energy is 84 kJ/mole, what is k at 30ºC? k 20 = 1.25 x 10 -5 L/mole/s and k 30 = 3.89 x 10 -5 L/mole/s 3. Evaluate the following data to determine whether the reaction A products is first or second order.
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Unformatted text preview: Calculate the rate constant and give its units. k = 0.192 L/mmol/s A ( m M ) T i m e ( s e c ) ______________________________________ 1.00 0 0.50 11 0.25 20 0.10 48 0.05 105 4. The forward rate law for the reaction O H OH H 2 + + is given as ] OH [ ] H [ k t d ] H [ d + + = The rate constant, k, at 20 C was found to be 1.3 x 10 11 liters/mole/sec. Assuming an initial concentration of H + of 10-4 M, how much time is required for one half of a small amount (<<10-4 M) of added OH-to react? (Assume for this calculation that the reaction is irreversible). t 1/2 = 5.3 x 10-8 sec 5. Text problems 2.17, 2.21, 2.22 ( 19.2 hr, 1 st-order reasonable ) and 2.23....
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