When studying the reaction between nitrobenzene and SO3, the following dependence of the initial rate on the initial concentration of sulfur trioxide was obtained:

С0SO3, mol/l 0.557 0.516 0.484 0.331 0.308
V0, arb. units 0.31 0.29 0.24 0.16 0.14
Determine the reaction order with respect to SO3.

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