185. Decomposition of a 0.025 M solution of oxalic acid in 99.5% (mass.) sulfuric acid gave the following results:

t, min 120 240 420 600
C(C2H2O4)*102, mol/l 2.11 1.78 1.36 1.05

Determine the order of the reaction. Calculate the rate constant and the time required for the decomposition of 60% oxalic acid.

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