Gibb's Free Energy

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What is Gibbs Free Energy?

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Gibbs Free Energy (G) is a thermodynamic potential that measures the maximum reversible work obtainable from a thermodynamic system at constant temperature and pressure. It is used to predict the spontaneity of a reaction.

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What is the formula for calculating Gibbs Free Energy?

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The formula is ΔG = ΔH - TΔS, where ΔG is the change in Gibbs Free Energy, ΔH is the change in enthalpy, T is the temperature in Kelvin, and ΔS is the change in entropy.

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What does a negative ΔG indicate about a reaction?

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A negative ΔG indicates that the reaction is spontaneous under the given conditions.

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What does a positive ΔG indicate about a reaction?

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A positive ΔG indicates that the reaction is non-spontaneous under the given conditions.

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What is enthalpy (ΔH)?

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Enthalpy (ΔH) is a measure of the total heat content of a system. It reflects the energy required to create a system and the energy required to make room for it by displacing its environment.

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What is entropy (ΔS)?

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Entropy (ΔS) is a measure of the disorder or randomness in a system. It quantifies the amount of energy in a physical system that is not available to do work.

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What is the significance of temperature in Gibbs Free Energy calculations?

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Temperature (T) affects the spontaneity of a reaction. Higher temperatures can make reactions with positive ΔH and positive ΔS spontaneous.

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What combination of ΔH and ΔS guarantees a non-spontaneous reaction?

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The combination of +ΔH and -ΔS guarantees a non-spontaneous reaction.

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What are the conditions for a spontaneous reaction with positive ΔH and positive ΔS?

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For a spontaneous reaction with positive ΔH and positive ΔS, the temperature must be very high.

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What are the best conditions for a spontaneous reaction?

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The best conditions for a spontaneous reaction are high negative enthalpy, high temperature, and high positive entropy.