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Cyanamide (NH2CN) is completely burnt in...

Cyanamide `(NH_2CN)` is completely burnt in excess oxygen in a bomb calorimeter, `DeltaU` was found to be -742.7 `"kJ mol"^(-1)`, calculate the enthalpy change of the reaction at 298K. `NH_2CN_((s))+3//2O_(2(g)) to N_(2(g)) + CO_(2(g)) +H_2O_((l)) DeltaH` =?

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Given: T=298 K , `DeltaU=-742.4 "kJ mol"^(-1)`
`DeltaH`=?
`DeltaH=DeltaU+Deltan_g RT`
`DeltaH=DeltaU+(n_p-n_r)RT`
`DeltaH=-742.4 +(2-3/2)xx8.314xx10^(-3)xx298`
`=-742.4+(0.5xx8.314xx10^(-3)xx298)`
=-742.4+1.24
`=-741.16 "kJ mol"^(-1)`
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