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The rate of reaction: H(2)O + 2S(2)O(4...

The rate of reaction:
`H_(2)O + 2S_(2)O_(4)^(2-)(aq) rarr 2HSO_(3)^(ɵ)(aq) + S_(2)O_(3)^(2-)(aq)`
was studied as follows. In an experiment, the concentration of `S_(2)O_(4)^(2-)(0.4 M)` half changed in `3.73 xx 10^(6) s`. In another experiment, `0.25 M S_(2)O_(4)^(2-)` half changed in `6.0 xx 10^(6) s`. Find the order of the reaction.

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