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

FREE Expert Solution

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


The balanced combustion reaction is: 

2 CH3OH(l) + 3 O2(g) → 2 CO2(g) + 4 H2O(l) 


ΔH°rxn=ΔH°f, prod-ΔH°f, react


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.


2 CH3OH(l) + 3 O2(g) → 2 CO2(g) + 4 H2O(l)


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Problem Details

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

Write a balanced equation for the combustion of methanol, find ΔH˚rxn, and determine the mass of carbon dioxide emitted per kJ of heat produced.

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What scientific concept do you need to know in order to solve this problem?

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.