80. The kinetics of the reaction of urea formation from ammonium cyanate NH4CNO→NH2CONH2 was studied by dissolving 22.9 l of ammonium cyanate in excess water to obtain 1 l of solution. The following data were obtained:
t, min 0 20 50 65 150
mV, g 0 7.0 12.1 13.8 17.7
Determine:
a) the order of the reaction
b) the mass of ammonium cyanate present in the solution after 300 min.

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