The rearrangement of ammonium cyanate to urea in aqueous solution at 50 °C NH4NCO(aq)-->(NH2)2CO(aq) is second order in NH4NCO. In one experiment, when the initial concentration of NH4NCO was 0.968 M, the concentration of NH4NCO dropped to 1.18x10^-1 M after 496 minutes had passed. Based on these data, the rate constant for the reaction is  _____M^-1 min^-1

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