# Problem: Methanol (CH3 OH) has been suggested as a fuel to replace gasoline. Write a balanced equation for the combustion of octane, C8H18, find ΔH˚rxn, and determine the mass of carbon dioxide emitted per kJ of heat produced. (ΔH˚rxn = –5074.1 kJ/mol for octane.)

###### FREE Expert Solution

We are asked to write a balanced equation for the combustion of octane, find ΔH˚rxn, and determine the mass of carbon dioxide emitted per kJ of heat produced.

The balanced combustion reaction is:

2 C8H18(l) + 25 O2(g) → 16 CO2(g) + 18 H2O(l)

Note that we need to multiply each ΔH˚f by the stoichiometric coefficient since ΔH˚f is in kJ/mol.

Also, note that ΔH˚f for elements in their standard state is 0.

95% (80 ratings) ###### Problem Details

Methanol (CH3 OH) has been suggested as a fuel to replace gasoline.

Write a balanced equation for the combustion of octane, C8H18, find ΔH˚rxn, and determine the mass of carbon dioxide emitted per kJ of heat produced. (ΔH˚rxn = –5074.1 kJ/mol for octane.)

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Our tutors have indicated that to solve this problem you will need to apply the Enthalpy of Formation concept. You can view video lessons to learn Enthalpy of Formation. Or if you need more Enthalpy of Formation practice, you can also practice Enthalpy of Formation practice problems.