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In a study of the rearrangement of ammonium cyanate to urea in aqueous solution at 50...

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 0.495 0.248 0.124 6.20×10-2
minutes 0 204 613 1.43×103



(1)
The observed half life for this reaction when the starting concentration is 0.495 M is min and when the starting concentration is 0.248 M is _____min.

(2)
The average deltax(1/[NH4NCO]) / deltax t from t = 0 min to t = 204 min is ________ M-1 min-1.
The average deltax(1/[NH4NCO]) / deltax from t = 204 min to t = 613 min is ______ M-1 min-1.

(3)
Based on these data, the rate constant for this ______ order reaction is _______M-1 min-1.

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