1.

The reaction of cyanamide, NH_2CN(s) with O_2 was carried out in a bomb calorimeter and Delta U was found to be -742.7 kJmol^-1 at 298 K. Calculate enthalpy change for the reaction at 298K.NH_2CN(s)+3/2O_2(g)rarrN_2(g)+CO_2(g)+H_2O(l)

Answer»

SOLUTION :`Delatan(G)=(1+1)-3/2=+1/2`
`DeltaU=-742.7 KJ mol^-1 R=8.314xx10^-3 kJ mol^-1k^-1DeltaH=DeltaU+DeltanRT=-742.7+1/2xx8.314xx10^-3xx298=-741.5 kJ`


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