Hello,
I am still a little confused about the concept of Gibbs Free Energy. Can someone please explain this?
Thank you !
Gibbs Free Energy
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Re: Gibbs Free Energy
Gibbs free energy is a measure of the potential for reversible or maximum work that may be done by a system at constant temperature and pressure. It is a thermodynamic property used to predict whether a process will occur spontaneously at constant temperature and pressure. Changes in the Gibbs free energy G correspond to changes in free energy for processes at constant temperature and pressure. The sign of a Gibbs energy value may be used to determine whether or not a chemical reaction proceeds spontaneously. If the sign for ΔG is positive, additional energy must be input for the reaction to occur. This means that it is an endothermic reaction because the energy of the products is greater than the energy of the reactants (product energy-reactant energy=positive number). This also makes sense because in endothermic reactions, you are building something so it requires extra energy to build a higher energy molecule. If the sign for ΔG is negative, the reaction is thermodynamically favorable and will occur spontaneously. This means that it is an exothermic reaction because the energy of the products is lower than the energy of the reactants (product energy-reactant energy=negative number). This also makes sense because in exothermic reactions, you are breaking something so it doesn't require as much energy because you are breaking a molecule to a lower energy molecule. Hope this helps!
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Re: Gibbs Free Energy
Gibbs free energy is a state function that is used to calculate the max reversible work under a constant pressure and temperature. It is the enthalpy of the system at any time minus the product of entropy and temperature.
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Re: Gibbs Free Energy
Gibbs free energy is energy that can be used to calculate the max reversible work under constant pressure and temperature in the equation ∆G = ∆H(enthalpy) - T∆S(entropy).
Re: Gibbs Free Energy
Gibbs free energy (G) is defined as the enthalpy of the system (H) minus the product of the temperature (T) times the entropy of the system (S) (G = H - TS). G combines enthalpy and entropy into a single value and is known as the free energy change for a reaction (or the maximum amount of work obtainable from a reaction). Hope that helps!
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Re: Gibbs Free Energy
G = H - TS
Gibbs Free energy is basically used to calculate the maximum reversible work that may be performed by a thermodynamic system at a constant temperature and pressure
Gibbs Free energy is basically used to calculate the maximum reversible work that may be performed by a thermodynamic system at a constant temperature and pressure
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