its an equilibrium problem,
37 degrees might not have a good yield of ammonia...
anyway, after many more research, i figured out that when urea is heated, the reation should be:
CO(NH2)2 --> NH4NCO, the reverse of Wöhler's famous synthesis of urea. (1st time of converting inorganic compounds to organic compounds), where NH4- ion converts to NH3 and escape, leaving the dangerous NCO- (cyanate) ion...
"In an open system, half the urea was destroyed after 5 hr @ 90 o C and pH 7, Half life estimated 25 years @ 25 o C "
from
http://carewinnipeg.com/OriginofLifeStudies.htm...
in order to calculate the yield under certain temperature, or the reaction rate, an equilibrium constant or reaction rate constant in certain temperature is needed..... which i cant find them anywhere, sorry about that...
