1.

the reaction between cyanamide NH_(2)CH(s) and oxygen was allowed to complete and DeltaU at 300 K was observed to be -743 kJ mol ^(-1) . The value of DeltaHat 300 K for the combustion reaction NH_(2) CN(s)+3/2 O_(2)(g) to N_(2)(g) + CO_(2)(g) + H_(2)O(l)would be

Answer»

`-741. 75 kJ mol ^(-1) `
`-743 KJ mol ^(-1)`
`-744 .25 kJ mol ^(-1)`
`- 740 . 5 kJ mol ^(-1)`

Solution :`DeltaH=DeltaU+(Deltan_(g))RT`
`=-743 + 1/2 xx8.314 xx300xx10^(-3)kJ mol^(-1)`
`741.75 kJ mol^(-1)`


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