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quiz3c_solutions

# quiz3c_solutions - particles of energy 400kB each What can...

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Name:_________________________________________ MCB100A/CHEM130 In-section Quiz3C (11-11-05, Aathavan) 1. Consider the following experimental curve of Cp during a thermal denaturation of a protein. What is the difference in entropy between the unfolded and folded states? Explain how you would go about the calculation. (5) Solution: dT TdS dT dq dT dH Cp = = = Rearranging, T CpdT dS = = 2 1 T T T CpdT S

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2. What is the multiplicity of the unbound system below for one particle at U = nε (2) ……………………………………… ______ ______ ______ ______ ______ ______ ______ ε ______ ______ 0 ______ Solution: For each energy level of energy nε, there are (n+1) positions. Since it is a single particle system W energy =1, Thus W = (n+1) 3. Let’s say that system at 300K has 1000 particles of energy 100kB each and 735
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Unformatted text preview: particles of energy 400kB each. What can you say about the two energy levels (In other words, what does the energy distribution of the system look like)? (3) Solution: If one applied Boltzmann’s distribution one would find that .367 2 1 1 300 / ) 100 400 ( / ) 2 1 ( = = = =-----e e e N N k k k kT U U However we are given 735 . 1000 735 2 1 = = N N … twice more than what the energy levels alone would dictate. This implies that the position multiplicity at 400k B is twice that at 100k B . The system would (in a simple case) look like ___367___ ___367___ 400k B ___1000___ 100k B...
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