When studying the interaction of nitrobenzene with sulfuric anhydride, the dependence of the initial velocity on the initial concentration of sulfuric anhydride was obtained.
[SO3], mol/l 0.893 0.557 0.484 0.354 0.278
W0, % conv./min. 0.59 0.25 0.19 0.11 0.08
Determine the order by sulfuric anhydride and K.

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