how do you know that the free energy change has a larger negative value than the

Question

how do you know that the free energy change has a larger negative value than the value for the enthalpy change? notice the heading says answer questions 20-25 from the following rxn. I dont understand how to figure out number 24 the correct answer is A but how. I think a formula is used Delta g=delta h-tDeltas or i dont know, help please. ok I tried to upload image twice but it did not work. The question on the exam was: The free energy change has a ______value than the value for the enthalpy change. a)larger negative b)larger positive c) smaller negative d)smaller positive e) not possible to predict

2A(g)+3B(l)---->2C(aq)+3D(g) + 100.kj

The change in enthalpy per mole of A and excess B is -50.0 kj

The change in internal energy per mole of A and excess B is -50.0kj -RT

Explanation / Answer

delta G= deltaH- TdeltaS

So the sign of deltA G is influenced by the sign of deltAH. when delta H is -ve for exothermic reactions, Tdelta S is +ve and hence the difference between deltaG becomes more -ve than deltaH.

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