Answered: The enthalpy of vaporization of ethanol…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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The enthalpy of vaporization of ethanol is 38.7 kj/mol at its boiling point (78C). Determine ΔS sys, ΔS surr and ΔS univ when 1.00 mole of ethanol is vaporized at 78 C and 1.00 atm.

Also my question is if ΔS univ = Δ S sys + Δ S surr,

and Δ S surr = -ΔH/T

then Δ S sys uses what formula

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Enthalpy of ethanol vaporization is 38.7 kJ/mol
The boiling point of ethanol is 78 degrees Celsius (^oC). On kelvin scale $bold italic T bold italic equals bold italic left parenthesis bold italic 28 bold italic plus bold italic 273 bold italic. bold italic 15 bold italic right parenthesis bold italic K bold italic rightwards double arrow bold italic 351 bold italic. bold italic 15 bold italic space bold italic K$

the reaction for the vaporization of ethanol is $bold italic C subscript bold italic 2 bold italic H subscript bold italic 5 bold italic O bold italic H bold italic left parenthesis bold italic l bold italic right parenthesis bold italic left right double arrow bold italic C subscript bold italic 2 bold italic H subscript bold italic 5 bold italic O bold italic H bold italic left parenthesis bold italic g bold italic right parenthesis$

During the boiling of ethanol, water and liquid ethanol exist in equilibrium and the ΔG or molar energy change free is zero. Therefore, $bold italic increment bold italic G bold italic equals bold italic increment bold italic H bold italic minus bold italic T bold italic increment bold italic S bold italic rightwards double arrow bold italic space bold italic 0 bold italic equals bold italic capital delta bold italic H subscript bold italic v bold italic a bold italic p end subscript bold italic minus bold italic T bold italic capital delta bold italic S$ $bold italic rightwards double arrow bold italic capital delta bold italic H subscript bold italic v bold italic a bold italic p end subscript bold italic equals bold italic T bold italic capital delta bold italic S$

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