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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

`NH_(2) CN_(g) +3/2 O_(2(g)) to N_(2(g)) +H_(2)O_(1) " "trianglen=2-5/2`
`triangleH=triangleU+trianglen RT`
`triangleH=-742+(-0.5) xx 8.314 xx 10^(-3) xx 298 " "triangleU="-742 kJ/mol"`
=-742.7 -1.238
`"=-743.94kJ/mol"^4`
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