It was noted in Sec. 16.4 that the trial-and-error method of determining reaction orders is poor. Data for the decomposition of (CH3)3COOC(CH3)3(g), species A, at 155°C are (where c° ≡ 1 mol/dm3):
t/min | 0 | 3 | 6 | 9 |
103[A]/c° | 6.35 | 5.97 | 5.64 | 5.31 |
t/min | 12 | 15 | 18 | 21 |
103[A]/c° | 5.02 | 4.74 | 4.46 | 4.22 |
(a) Plot log10 103[A] versus t and (103[A])—1 versus t and see if you can decide which plot is more nearly linear. (b) Make a Powell plot and see if this allows the order to be determined.
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