5. As a result of studying the reaction Cu (NH4)2S2O8=CuSO4 (NH4)2SO4
the following data were obtained.
t, min 0 5 10 25
[CuSO4], mol/l 0 0.010 0.020 0.048
The initial concentration of (NH4)2S2O8 is 0.219 mol/l. Determine the order of the reaction.

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