[AG (Ag ) + AGF(CH)]- [AG;(AgCI) ] =[(1 mol)(77.1 kJ/mol) + (1 mol)(- 131.3 kJ/mol)]-[(1 mol)(- 109.8 kJ/mol) ] %3D = 55.7 kJ 55700 J *The positive value of AG° indicates that the reaction is non-spontaneous at 25°C. This means that the reverse reaction is more spontaneous. Activity 3 Problem Solving Directions: Calculate the AH, AS", AG°. Show your complete solution. 1. Determine the spontaneity of the dissociation of ammonium nitrate (NH,NO3), the compound used in cold packs. Interpret the values obtained from the calculations. The temperature is 298.15 K. NH,NO3 () NH, (a9) + NO3 (aq) Substance NHNO3 (9) NO3 (ag). -132.5 -207.4 AH° (kJ/mol) S (J/mol-K) -365.6 151.1 113.0 146.4 a. Calculate the AH", Page | 5

[AG (Ag ) + AGF(CH)]- [AG;(AgCI) ] =[(1 mol)(77.1 kJ/mol) + (1 mol)(- 131.3 kJ/mol)]-[(1 mol)(- 109.8 kJ/mol) ] %3D = 55.7 kJ 55700 J *The positive value of AG° indicates that the reaction is non-spontaneous at 25°C. This means that the reverse reaction is more spontaneous. Activity 3 Problem Solving Directions: Calculate the AH, AS", AG°. Show your complete solution. 1. Determine the spontaneity of the dissociation of ammonium nitrate (NH,NO3), the compound used in cold packs. Interpret the values obtained from the calculations. The temperature is 298.15 K. NH,NO3 () NH, (a9) + NO3 (aq) Substance NHNO3 (9) NO3 (ag). -132.5 -207.4 AH° (kJ/mol) S (J/mol-K) -365.6 151.1 113.0 146.4 a. Calculate the AH", Page | 5

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

Chapter17: Spontaneity, Entropy, And Free Energy

Section: Chapter Questions

Problem 112CWP: The equilibrium constant for a certain reaction increases by a factor of 6.67 when the temperature...

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PROBLEM SOLVING NUMBER 3

[AG (Ag ) + AGF(CH)]- [AG;(AgCI) ]
=[(1 mol)(77.1 kJ/mol) + (1 mol)(- 131.3 kJ/mol)]-[(1 mol)(- 109.8 kJ/mol) ]
%3D
= 55.7 kJ 55700 J
*The positive value of AG° indicates that the reaction is non-spontaneous at 25°C. This means that the reverse
reaction is more spontaneous.
Activity 3 Problem Solving
Directions: Calculate the AH, AS", AG°. Show your complete solution.
1. Determine the spontaneity of the dissociation of ammonium nitrate (NH,NO3), the compound used in cold packs.
Interpret the values obtained from the calculations. The temperature is 298.15 K.
NH,NO3 ()
NH, (a9) + NO3 (aq)
Substance
NHNO3 (9)
NO3 (ag).
-132.5
-207.4
AH° (kJ/mol)
S (J/mol-K)
-365.6
151.1
113.0
146.4
a.
Calculate the AH",
Page | 5

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