Ammonium cyanate, NH 4 NCO, rearranges in water to give urea, (NH 2 ) 2 CO. Using

Question:

Ammonium cyanate, NH₄NCO, rearranges in water to give urea, (NH₂)₂CO.

Time (min) 0 4.50 x 10 1.07 x 10 2.30 X 10 6.00 x 10 [NH4NCO] (mol/L) 0.458 0.370 0.292 0.212 0.114

Using the data in the table:
(a) Decide whether the reaction is first-order or second-order.
(b) Calculate k for this reaction.
(c) Calculate the half-life of ammonium cyanate under these conditions.
(d) Calculate the concentration of NH₄NCO after 12.0 hours.