Question

When ethanol (CH3CH2OH) is combusted, such as when in a gasoline blend, the following reaction occurs:...

When ethanol (CH3CH2OH) is combusted, such as when in a gasoline blend, the following reaction occurs:

2CH3CH2OH(l)+6O2(g)--->4CO2(g)+6H2O(g)

Based on the standard free energies of formation given in the table below, what is the standard free energy change for this reaction?

Substance ?G?f
(kJ/mol)
CH3CH2OH(l) -174.9
O2(g) 0
CO2(g) -394.4
H2O(g) -228.6

Express your answer to one decimal place and include the appropriate units.

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Answer #1

Standard free energy change for the reaction = sum of free energy of products - sum of free energy of reactants

                                                                         = [4 x -394.4 + 6 x -228.6] - [2 x -174.9 + 6 x 0]

                                                                         = -2599.4 kJ/mol

Thus, the standard free energy change for this reaction is -2599.4 kJ/mol

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