What is Gibbs Free Energy?

What will happen to Gibbs' free energy if...?

  • The reaction CaCO3 (s) CaO (s) + CO2 (g) is endothermic. What will happen to the Gibbs free energy if the temperature increases? A. One cannot predict since S is not known B. It will remain the same C. It will increase D. It will decrease And can you explain why you picked the answer you did, please?

  • Answer:

    Following this formula: ΔG*=ΔH-TΔS. As temperature rises, the free energy will decrease and this reaction will become more spontaneous. If you increase the temperature, your entropy increases (increasing disorder). Because you are increasing that ΔS, you are making the total more negative. Adding heat to an endothermic reaction (absorbs heat), the reaction will definitely favor products (--->), and therefore be more spontaneous.

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