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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)`A. `-300 kJ mol^(-1)`B. `-390 kJ mol^(-1)`C. `-400 kJ mol^(-1)`D. `-350 kJ mol^(-1)` |
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Answer» (A) `DeltaH^(@)=sum(BE)_(R )-sum(BE)_(P)` `=(2xx350+500)-(1500)` `=-300 kJ mol^(-1)` |
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