1.

Calculate enthalpy change for the reaction C(dimond)+O_(2)(g) to CO_(2)(g) Given: Energy required to break C-C bond in diamond is 350 kJ mol^(-1) DeltaH_(f,O(g))^(@)=250kJ mol^(-1) DeltaH_("atomisation,CO_(2)(g)")^(@)=1500kJ mol^(-1)

Answer»

`-300 kJ MOL^(-1)`
`-390 kJ mol^(-1)`
`-400 kJ mol^(-1)`
`-350 kJ mol^(-1)`

Solution :(A) `DELTAH^(@)=sum(BE)_(R )-sum(BE)_(P)`
`=(2xx350+500)-(1500)`
`=-300 kJ mol^(-1)`


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