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2CH3CH2OH(1) + 602(g)—4CО2(в) + 6H20(g) Based on the standard free energies of formation given in the table below, what is the standard ree energy change for this reaction? AG Substance kJ/mol) |СHз CH2ОH(1)| — 174.9

2CH3CH2OH(1) + 602(g)—4CО2(в) + 6H20(g) Based on the standard free energies of formation given in the table below, what is the standard ree energy change for this reaction? AG Substance kJ/mol) |СHз CH2ОH(1)| — 174.9

Principles of Modern Chemistry
Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter14: Chemical Equilibrium
Section: Chapter Questions
Problem 108CP
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The standard free energy of formation, AG: , of a substance is the free energy change for the formation of one mole of the substance from the component elements in their standard states. These values are applicable at 25°C and are found in thermodynamic tables. The value of AG; for a substance gives a measure of the thermodynamic stability with respect to the component elements. Negative values for a formation reaction indicate thermodynamic stability of the product. In other words, the compound formed does not spontaneously decompose back into the component elements. Positive values for a formation reaction indicate thermodynamic instability of the product. Thus, the compound will spontaneously decompose, though the rate may be slow. The sign of AG: can be used to predict the feasibility of synthesizing a substance from its component elements. The standard free energy change for a reaction, AG°, is a state function and can be calculated from the standard free energies of formation as follows: ΔG Ση, AG; (products) -Ση ΔG; (reactants) where np and n, represent the stoichiometric coefficients in the balanced chemical equation for the reactants and products respectively.
Transcribed Image Text:The standard free energy of formation, AG: , of a substance is the free energy change for the formation of one mole of the substance from the component elements in their standard states. These values are applicable at 25°C and are found in thermodynamic tables. The value of AG; for a substance gives a measure of the thermodynamic stability with respect to the component elements. Negative values for a formation reaction indicate thermodynamic stability of the product. In other words, the compound formed does not spontaneously decompose back into the component elements. Positive values for a formation reaction indicate thermodynamic instability of the product. Thus, the compound will spontaneously decompose, though the rate may be slow. The sign of AG: can be used to predict the feasibility of synthesizing a substance from its component elements. The standard free energy change for a reaction, AG°, is a state function and can be calculated from the standard free energies of formation as follows: ΔG Ση, AG; (products) -Ση ΔG; (reactants) where np and n, represent the stoichiometric coefficients in the balanced chemical equation for the reactants and products respectively.
When ethanol (CH3CH2OH) is combusted, such as when in a gasoline blend, the following reaction occurs: 2CH3CH2OH(1) + 602(g)—4CО2 (8) + 6H20(g) Based on the standard free energies of formation given in the table below, what is the standard free energy change for this reaction? AG Substance kJ/mol) CH3 CH2 OH(1) –174.9 O2 (g) CO2 (g) -394.4 H2O(g) -228.6 Express your answer to one decimal place and include the appropriate units.
Transcribed Image Text:When ethanol (CH3CH2OH) is combusted, such as when in a gasoline blend, the following reaction occurs: 2CH3CH2OH(1) + 602(g)—4CО2 (8) + 6H20(g) Based on the standard free energies of formation given in the table below, what is the standard free energy change for this reaction? AG Substance kJ/mol) CH3 CH2 OH(1) –174.9 O2 (g) CO2 (g) -394.4 H2O(g) -228.6 Express your answer to one decimal place and include the appropriate units.
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