Chap_12_HW_solutions

Chap_12_HW_solutions - Chapter 12 homework solutions

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Chapter 12 Homework Solutions 22. Consider the general reaction: aA + bB cC and the following average rate data over some time period t: s L mol t A = Δ Δ / 0080 . 0 s L mol t B = Δ Δ / 012 . s L mol t C = Δ Δ / 0160 . Determine a set of possible coefficients to balance this general reaction. 30. The following data were obtained for the reaction: 2 ClO 2 (aq) + 2 OH - (aq) ClO 3 - (aq) + ClO 2 - (aq) + H 2 O (l) , where [ ] t ClO Rate Δ Δ = 2 [ClO 2 ] o (mol/L) [OH - ] o (mol/L) Initial Rate (mol/L*s) 0.0500 0.100 5.75 x 10 -2 0.100 0.100 2.30 x 10 -1 0.100 0.0500 1.15 x 10 -1 a. Determine the rate law and the value of the rate constant. b. What would be the initial rate for an experiment with [ClO 2 ] o = 0.175 M and [OH - ] o = 0.0844 M?
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44. The rate law for the decomposition of phosphine (PH 3 ) is [] 3 3 PH k t PH Rate = Δ Δ = . It takes 120 s for 1.00 M PH 3 to decrease to 0.250 M. How much time is required for 2.00 M PH 3 to decrease to a concentration of 0.350 M? 48. Consider the hypothetical reaction: A + B + 2C 2D + 3E where the rate law is: 2 B A k t A Rate = Δ Δ = . An experiment is carried out where [A] o = 1.0 x 10 -2 M, [B] o = 3.0 M, and [C] o = 2.0 M. The reaction is started, and after 8.0 seconds, the concentration of A is 3.8 x 10 -3 M.
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Chap_12_HW_solutions - Chapter 12 homework solutions

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