Problem: Ethanol (C2H5OH) is currently blended with gasoline as an automobile fuel.Calculate the standard enthalpy change for the reaction, assuming H2O(g) as a product.

FREE Expert Solution

We’re being asked to determine the standard enthalpy change for the reaction of ethanol (C2H5OH) that produces H2O as a product.


Recall that standard enthalpy change (ΔH˚rxn) can be calculated from the enthalpy of formation (ΔH˚f) of the reactants and products involved:


H°rxn = H°f, products -H°f, reactants


We will do the following steps:

Step 1: Write the balanced equation for the reaction

Step 2: Calculate the standard enthalpy change for the reaction

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Problem Details

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

Calculate the standard enthalpy change for the reaction, assuming H2O(g) as a product.

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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.