The standard enthalpy of formation of octane `(C_(8)H_(18))` is `-250kJ //mol`. Calculate the enthalpy of combustion of `C_(8)H_(18)`. The enthalpy of formation of `CO_(2)(g)` and `H_(2)O(l)` are `-394 kJ//mol` and `-286kJ//mol` respectively.A. `- 5200` kJ/molB. `- 5726` kJ/molC. `- 5476` kJ/molD. `- 5310` kJ/mol

The standard enthalpy of formation of octane `(C_(8)H_(18))` is `-250k

1.	The standard enthalpy of formation of octane `(C_(8)H_(18))` is `-250kJ //mol`. Calculate the enthalpy of combustion of `C_(8)H_(18)`. The enthalpy of formation of `CO_(2)(g)` and `H_(2)O(l)` are `-394 kJ//mol` and `-286kJ//mol` respectively.A. `- 5200` kJ/molB. `- 5726` kJ/molC. `- 5476` kJ/molD. `- 5310` kJ/mol
Answer» Correct Answer - C `C_(8)H_(18)(g)+(25)/(2)O_(2)(g)rarr8CO_(2)(g)+9H_(2)O(l)` `Delta_(r )H^(@)=8xx(-394)+9xx(-286)-(-250)` `=-5476 " kJ"//"mol"`

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