At t = 0, butadiene was introduced into an empty vessel at 326°C and the gas-phase dimerization reaction 2C4H6 → C8H12 was followed at constant volume by monitoring the pressure P. The following data were obtained (1 ks = 103 s):
t/ks | P/torr | t/ks | P/torr | t/ks | P/torr |
0 | 632.0 | 1.751 | 535.4 | 5.403 | 453.3 |
0.367 | 606.6 | 2.550 | 509.3 | 7.140 | 432.8 |
0.731 | 584.2 | 3.652 | 482.8 | 10.600 | 405.3 |
1.038 | 567.3 |
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(a) Find the reaction order using a Powell plot or the fractional- life method. (b) Evaluate the rate constant.
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