Chemistry Worksheets - Chem 340, Fall 2013 Page 6
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193.36 The protein lysozyme unfolds at a transition temperature of 75.5°C and the standard
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enthalpy of transition is 509 kJ mol
. Calculate the entropy of unfolding of lysozyme at 25.0°C,
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given that the difference in the constant-pressure heat capacities upon unfolding is 6.28 kJ K
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mol
and can be assumed to be independent of temperature. Hint. Imagine that the transition at
25.0°C occurs in three steps: (i) heating of the folded protein from 25.0°C to the transition
temperature, (ii) unfolding at the transition temperature, and (iii) cooling of the unfolded protein to
25.0°C. Because the entropy is a state function, the entropy change at 25.0°C is equal to the
sum of the entropy changes of the steps.
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