Did either student perform the calculation correctly? If not, what did they do wrong? If neither student performed the calculation correctly, what is the correct set-up and value for the entropy of the system?

Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter18: Principles Of Chemical Reactivity: Entropy And Free Energy
Section: Chapter Questions
Problem 1PS: Solid NH4NO3 is placed in a beaker containing water at 25 C. When the solid has completely...
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1) The entropy values for the reaction below are given in the table.

2 PCl3(g) + O2(g) → 2POCl3(g)
Student A calculated the ΔS for the reaction as follows:
ΔS°reaction = [(325.45 J/mol∙K)]− [(311.78 J/mol∙K)+( 205.14 J/mol∙K)]
Student B calculated the ΔS for the reaction as follows:
ΔS°reaction = [(2 moles)(311.78 J/mol∙K)+(1 mole)(205.14 J/mol∙K)] − [(2 moles)(325.45 J/mol∙K)]
Did either student perform the calculation correctly? If not, what did they do wrong?

If neither student performed the calculation correctly, what is the correct set-up and value for the entropy of the
system?

 

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