Chem_208_22_07_web - 1 PS 9 Assigned today Today: Ch...

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Unformatted text preview: 1 PS 9 Assigned today Today: Ch 19.2-19.6; Tues: Finshing Ch. 19 2 The Concept of Entropy (S) Entropy is proportional to the number of configurations (states) of the microscopic particles of the system. More configurations (greater disorder) greater entropy S = k ln W W = the number of microstates accessible to system k = Boltzmann constant = R/N A 3 S is based on two measurable quantities: q rev = heat absorbed by system in a reversible process T = temperature of system in Kelvin T S , Change ntropy E rev q = A reversible expansion process: - infinitesimally small grains of sand are removed one at a time.- adding one grain at any time would reverse process. 4 Entropy Changes in Phase Transitions T q S rev = S tr = H tr /T tr 5 Entropy Changes in Phase Transitions he enthalpy of vaporization of water is 40.7 kJ/mol at 100 o C. What is the molar entropy of vaporization of water at 100 o C?...
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Chem_208_22_07_web - 1 PS 9 Assigned today Today: Ch...

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