425. As a result of dissolution in water, ammonium cyanate turns into urea, NH4NCO → CO(NH2)2. Determine the kinetic order, the rate constant and the initial concentration of NH4NCO from the following data (C is the current concentration of NH4NCO; t is the time after the preparation of the solution):
t, hour 2 4 10 20 40 80
C, mol/L 0.186 0.176 0.151 0.122 0.089 0.0570

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