Problem: Ethanol (C2H5OH) is currently blended with gasoline as an automobile fuel.Calculate the mass of CO2 produced per kJ of heat emitted.

FREE Expert Solution

We are asked to calculate the mass of CO2 produced per kJ of heat emitted.


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.


Balanced reaction: 

C2H5OH(g) + 6 O2(g)→ 4 CO2(g) + 4 H2O(g) 

Molar mass CO2 = 44.01 g/mol


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Problem Details

Ethanol (C2H5OH) is currently blended with gasoline as an automobile fuel.

Calculate the mass of CO2 produced per kJ of heat emitted.

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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.

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