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. When propanol (CH3CH2CH2OH) is combusted, such as when in a gasoline blend, the following reaction occurs: 2CH3 CH2 CH2OH(1) + 902 (g)→6CO2(g)+8H2O(g) Based on the standard free energies of formation given in the table below, what is the standard free energy change for this reaction? 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. AG Substance kJ/mol) СH3 CHCH2OН()| — 360.5 O2 (g) The sign of AG can be used to predict the feasibility of CO2 (8) -394.4 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 H2O(g) -228.6 of formation as follows: Express your answer to one decimal place and include the appropriate units. ΔG Σn, ΔG; (products) -Ση, ΔG (reactants) μΑ ? where np and ny represent the stoichiometric coefficients in the balanced chemical equation for the reactants and products respectively. AG° = Value Units
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. When propanol (CH3CH2CH2OH) is combusted, such as when in a gasoline blend, the following reaction occurs: 2CH3 CH2 CH2OH(1) + 902 (g)→6CO2(g)+8H2O(g) Based on the standard free energies of formation given in the table below, what is the standard free energy change for this reaction? 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. AG Substance kJ/mol) СH3 CHCH2OН()| — 360.5 O2 (g) The sign of AG can be used to predict the feasibility of CO2 (8) -394.4 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 H2O(g) -228.6 of formation as follows: Express your answer to one decimal place and include the appropriate units. ΔG Σn, ΔG; (products) -Ση, ΔG (reactants) μΑ ? where np and ny represent the stoichiometric coefficients in the balanced chemical equation for the reactants and products respectively. AG° = Value Units
Chemistry for Engineering Students
4th Edition
ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
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Chapter10: Entropy And The Second Law Of Thermodynamics
Section: Chapter Questions
Problem 10.84PAE: Methane can be produced from CO and H2.The process might be done in two steps, as shown below, with...
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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.
When propanol (CH3 CH2CH2 OH) is combusted, such as when in a gasoline blend, the
following reaction occurs:
2CH3 CH2 CH2OH(1) + 902 (g)→6CO2(g) + 8H2O(g)
Based on the standard free energies of formation given in the table below, what is the standard
free energy change for this reaction?
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.
AG
Substance
kJ/mol)
CH3 CH2CH2 OH(1)| –360.5
O2 (g)
CO2 (g)
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:
-394.4
H2O(g)
-228.6
Express your answer to one decimal place and include the appropriate units.
ΔG Σn, ΔG; (products)-Ση ΔG; (reactants)
μΑ
?
where np and n, represent the stoichiometric coefficients in
the balanced chemical equation for the reactants and products
respectively.
AG° =
Value
Units
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