Chemistry & Chemical Reactivity
9th Edition
ISBN:9781133949640
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
Section18.5: Entropy Changes And Spontaneity
Problem 1RC
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Question
What is S° for A in the reaction 3 A → 2 B if ∆S°(rxn) =-147.3 J/mol ・ K? [S° (B) = (240.0 J/mol ・K)]
Expert Solution
Step 1
Entropy measures the randomness of a molecule in a system. Thus entropy order-
S(gas)> S(liquid)> S( solid)
For a reaction, A = B + C
∆ S(rxn) = total entropy of products- total entropy of reactant.
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