In a study of the rearrangement of ammonium cyanate to urea in aqueous solution at 50 °C NH4NCO(aq)(NH2)2CO(aq) the following data were obtained: [NH4NCO], M 0.780 0.390 0.195 9.75×10-2 minutes 0 131 393 918 Hint: It is not necessary to graph these data. (1) The observed half life for this reaction when the starting concentration is 0.780 M is______ min and when the starting concentration is 0.390 M is ______min. (2) The average (1/[NH4NCO]) / t from t = 0 min to t = 131 min is______ M-1 min-1. The average (1/[NH4NCO]) / t from t = 131 min to t = 393 min is_____ M-1 min-1. (3) Based on these data, the rate constant for this _______ (zerofirstsecond) order reaction is M-1 min-1.   fill in the blanks

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