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ANSWERS TO CHAPTER 12 HOMEWORK 12.24 (a) For the first-order reaction, half the A molecules are converted to B molecules each minute. (b) Because half of the A molecules are converted to B molecules in 1 minute, the half- Life is 1 minute. 12.34 (a) The instantaneous rate of decomposition of N2O5 at t = 200 s is determined from the slope of the curve at t = 200s. Rate = 2.4 x 10 -5 M/s. 12.37 (a) The rate of consumption of O 2 is 1.25 times faster. (b) The rate of formation of NO is the same. The rate of formation of H 2 O is 1.5 times faster. 12.46 (a) Rate = k[CH 3 COCH 3 ] (b) k = 8.7 x 10 -3 /s (c) Rate = 1.6 x 10 -5 M/s 12.47 (a) Rate = k[CH 3 NNCH 3 ] (b) k = 2.5 x 10 -4 /s (c) Rate =5.0 x 10 -6 M/s

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12.49 (a) Rate = k[N O] m [Cl 2 ] n (b) k = 3.0/(M 2 s) (c) Rate = 6.1 x 10 -6 M/s 12.51 k = 5.11 x 10 -5 /s (a) t = 7200 s (b) t = 40.8 min [CH 3 NC] t = 0.0235 M (c) If 20% of the CH3NC reacts then 80% remains. [CH
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