Lesson_27_-_Example_Solutions_-_2009_

Lesson_27_-_Example_Solutions_-_2009_ - Lesson 27 Example...

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Lesson 27 Example 27-1 The slow oxidation of Fe 2+ by O 2 follows the differential rate law: [ ] [ ] 2 O 2 2 2 P Fe k dt Fe d + + = - At 35 o C and 0.5 M HClO 4 , k = 3.7 x 10 -3 L/mol.atm.h. Assume P O2 = 0.2 atm. Calculate t 1/2 of a 0.10 M Fe 2+ solution in 0.5 M HClO 4 that is exposed to air. How many days would be required for the Fe 2+ concentration to drop to 0.01 M? ____________________________________________________________________________________________ Solution: 1

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Lesson 27 days 563 h 24 day mol 1 . 0 L atm 2 . 0 1 L 10 x 7 . 3 h atm mol C kP 1 t t kP C 1 C 2 t kP C 1 C 1 dt kP C dC dt kP dC dC P kC dt dC 3 o 2 O 2 / 1 2 / 1 2 O o o 2 O o C o C t 0 2 O 2 2 O 2 2 O 2 = = = = - = - = - = - = - - ∫ ∫ 2
Lesson 27 days 10 x 07 . 5 h 24 day atm 2 . 0 1 L 10 x 7 . 3 h atm mol L / mol 1 . 0 1

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Lesson_27_-_Example_Solutions_-_2009_ - Lesson 27 Example...

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