1. A potential chemical reaction at 25.0 °C has a ΔHrxn of 147.5 kJ and a ΔSrxn of -386.9 J/K. What is the ΔGrxn in kJ.  (Enter answer to 3 significant figures and include no units in your answer) Also, what is true about the potential reaction in the previous problem? a. spontaneous b. illegal c. combustive d. nonspontaneous

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 102SCQ
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1. A potential chemical reaction at 25.0 °C has a ΔHrxn of 147.5 kJ and a ΔSrxn of -386.9 J/K. What is the ΔGrxn in kJ.  (Enter answer to 3 significant figures and include no units in your answer)

Also, what is true about the potential reaction in the previous problem?

a. spontaneous

b. illegal

c. combustive

d. nonspontaneous

Expert Solution
Step 1

Given,

Temperature, T = 25oC = (25 + 273.15) K = 298.15 K

△Srxn = –386.9 J/K

△Hrxn = 147.5 kJ = 147500 J    (1 kJ = 1000 J)

Step 2

The value of △Grxn can be calculated using the Gibb’s free energy formula as :

Chemistry homework question answer, step 2, image 1

Since the value of △Grxn is positive, so the reaction will be non-spontaneous.

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