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19. Chemical Thermodynamics

Entropy Calculations: Phase Changes

19. Chemical Thermodynamics

Entropy Calculations: Phase Changes

Multiple Choice
Which phase change results in an increase in entropy?
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Multiple Choice
Calculate entropy of vaporization of 8.4 g of acetic acid (CH₃COOH) with a boiling point of 118 °C, ∆H_vap = 23.7 kJ/mol.
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Multiple Choice
The boiling point of a liquid is 64°C and the enthalpy change for the conversion of this liquid to the gas is 32.21 kJ/mole. What is the entropy change for vaporization, ΔSvap, in J/(mol·K)?
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Multiple Choice
The normal boiling point of water is 100.0 °C and its molar enthalpy of vaporization is 40.67 kJ/mol. What is the change in entropy in the system in J/K when 39.3 grams of steam at 1 atm condenses to a liquid at the normal boiling point?
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