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The reaction of cyanamide (s), with diox...

The reaction of cyanamide (s), with dioxygen was carried out in a bomb calorimeter and `DeltaU` was found to be `-742.7` kJ `mol^(-1)` at 298 K. Calculate the enthalpy change for the reaction at 298 K.
`NH_(2)CN_((g))+(3)/(2)O_(2)(g)toN_(2(g))+CO_(2(g))+H_(2)O_(l)`

Text Solution

Verified by Experts

Number of gaseous molecules of reactants `=1+1.5=2.5`
Number of gaseous molecules of products `=1+1+0=2`
`Deltan=2-2.5=-0.5`
`DeltaH=DeltaU+DeltanRT`
`=-742.7+(-0.5xx8.314xx10^(-3)xx298)`
`=-743.9` kJ
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