A student obtained the following data for the rearrangement of ammonium cyanate to urea in aqueous solution at 50 C. NHANCO(aq)- (NH2)2CO(aq)

1- 44.1potassium bromideKBr138.9152
KBrKBrKBrKBr
weight percent = —— %
molality =——–  m
mole fraction = —–
molarity = —– M
2- solid sol_________solid,liquid,gasl,iquid or solid
_________solid,liquid,gas,liquid or solid
3-
gas phase decompositionethyl chloroformate123
ClCOOC2H5——–> C2H5Cl + CO2
4326.60×10-5-14.80×10-4-1
4-

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Attachment 2

A student obtained the following data for the rearrangement of ammonium cyanate to urea in aqueous solution at 50 C.NHANCO(aq)- (NH2)2CO(aq)[NHANCO], M0.7250.3630.1829.10×10-2minutes1444321.01×103(1) What is the half-life for the reaction starting at t=0 min?minWhat is the half-life for the reaction starting at t=144 min?minDoes the half-life increase, decrease or remain constant as the reaction proceeds?(2) Is the reaction zero, first, or second order?(3) Based on these data, what is the rate constant for the reaction?M-1min-