9.2. The standard heat of combustion of liquid n-octane to form CO2 and liquid w

Question

9.2. The standard heat of combustion of liquid n-octane to form CO2 and liquid water at 25 and i atmis AH:--5471 kJ/mol. (a) Briefly explain what that means. Your explanation Briefly explain what that means. Your explanation may take the form "When (specify quantities of reactant species and their physical states) react to form (quantities of product species and their physical states), the change in enthalpy is .. (b) Is the reaction exothermic or endothermic at 25°C? Would you have to heat or cool the reactor to keep the temperature constant? What would the temperature do if the reactor ran adiabatically?

Explanation / Answer

Heat of combustion - heat of combustion of substance is heat liberates when one mole of the substance undergoes complete combution with oxygen in constant pressure Reaction

combustion always exothermic

C8H18(l) +(25/2) O2(g) -----> 8CO2(g) + 9H2O (l)

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