GIBBS FREE ENERGY EQUATION

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Presentation transcript:

GIBBS FREE ENERGY EQUATION

Spontaneous or Not? We’ve seen the favorable conditions for a spontaneous reaction in terms of enthalpy and entropy individually We’ve seen situations where only one of the two conditions is favorable, so how can we predict?

(https://www. delsearegional (https://www.delsearegional.us/Academic/Classes/highschool/science/chemistry/firstyear/Notes/academic/Unit07/slideshows/gibbs.html)

TEMPERATURE: THE DECIDING FACTOR! Gibbs Free Energy Equation allows us to relate the two factors at a given temperature to determine if a reaction is spontaneous Gibbs helps us evaluate those circumstances If Gibbs is – the reaction will occur If Gibbs is + it will not ΔG = ΔH – TΔS

Situations: Consider this + enthalpy and + entropy ΔG = ΔH – TΔS

Situations: Consider this - enthalpy and - entropy

Sample Problems The ΔH for a certain reaction is -127.5 kJ and the ΔS is -0.34 kJ/ºK Calculate the ΔG at 25º C. Will this reaction be spontaneous at 500K?