handout_L03_Entropy1 - Lecture 3 Intro to Entropy Reading...

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Lecture 3: Intro to Entropy • Reading: Zumdahl 10.1, 10.3 • Outline: – Why enthalpy isn’t enough. – Statistical interpretation of entropy – Boltzmann’s Formula Enthalpy and Spontaneous Rxns • Early on in the development of thermodynamics, it was believed that if a reaction was exothermic, it was spontaneous. • Consider the following reaction: H 2 O(s) H 2 O(l) rxn = +6.02 kJ • Endothermic…. .yet spontaneous! Enthalpy and Spontaneous Rxns • Consider the following problem: Mixing of a gas inside a bulb adiabatically (q = 0). • q = 0, w = 0, E = 0, and H = 0 ….but it still happens Statistical Interpretation of Entropy • Imagine that we have a collection of 3 distinguishable particles who have a total energy of 3 ε . • Let’s ask the question, “How will this fixed amount of energy distribute itself over the particles?” Statistics and Entropy (cont.) • Our system consists of three distinguishable particles.
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handout_L03_Entropy1 - Lecture 3 Intro to Entropy Reading...

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