Exercise 17.38 Given the values of H rxn, S rxn, and T below, determine S univ.

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Exercise 17.38

Given the values of Hrxn, Srxn, and T below, determine Suniv.

Part A

Hrxn= 81 kJ , Srxn= 152 J/K , T= 308 K

Express your answer using two significant figures.

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Part B

Hrxn= 81 kJ , Srxn= 152 J/K , T= 756 K

Express your answer using one significant figure.

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Part C

Hrxn= 81 kJ , Srxn= 152 J/K , T= 308 K

Express your answer using two significant figures.

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Part D

Hrxn= 81 kJ , Srxn= 152 J/K , T= 407 K

Express your answer using two significant figures.

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Part E

Predict whether or not the reaction in part A will be spontaneous.

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Part F

Predict whether or not the reaction in part B will be spontaneous.

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Part G

Predict whether or not the reaction in part C will be spontaneous.

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Part H

Predict whether or not the reaction in part D will be spontaneous.

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Chemistry 106 Summer 2016

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Homework Set #6

Exercise 17.38

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Exercise 17.38

Given the values of Hrxn, Srxn, and T below, determine Suniv.

Part A

Hrxn= 81 kJ , Srxn= 152 J/K , T= 308 K

Express your answer using two significant figures.

Suniv =   J/K  

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Part B

Hrxn= 81 kJ , Srxn= 152 J/K , T= 756 K

Express your answer using one significant figure.

Suniv =   J/K  

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Part C

Hrxn= 81 kJ , Srxn= 152 J/K , T= 308 K

Express your answer using two significant figures.

Suniv =   J/K  

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Part D

Hrxn= 81 kJ , Srxn= 152 J/K , T= 407 K

Express your answer using two significant figures.

Suniv =   J/K  

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Part E

Predict whether or not the reaction in part A will be spontaneous.

Predict whether or not the reaction in part A will be spontaneous. spontaneous nonspontaneous

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Part F

Predict whether or not the reaction in part B will be spontaneous.

Predict whether or not the reaction in part B will be spontaneous. spontaneous nonspontaneous

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Part G

Predict whether or not the reaction in part C will be spontaneous.

Predict whether or not the reaction in part C will be spontaneous. spontaneous nonspontaneous

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Part H

Predict whether or not the reaction in part D will be spontaneous.

Predict whether or not the reaction in part D will be spontaneous. spontaneous nonspontaneous

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Explanation / Answer

Part A

Delta S Universe = Delta Ssystem + Delta Ssurroundings

System is the reaction

Delta Ssystem = 152 J/K

Dela Ssurrounding = -DeltaH/T
= -81000J/308 K = - 262.98 J

Delta S Universe = 152 - 262.98
= - 110.98

Part B

Hrxn= 81 kJ , Srxn= 152 J/K , T= 756 K

Delta Ssurr = - 81000 / 756 = -107.14 J/K

Delta S univ = 152 - 107.14 = 44.86 J/K

Part C

Hrxn= 81 kJ , Srxn= 152 J/K , T= 308 K

Delta S surr = -81000 / 308 = -262.98 J/K

Delta S univ = -152 - 262.98 = -414.98 J/K

Part D

Hrxn= 81 kJ , Srxn= 152 J/K , T= 407 K

Delta S surr = 81000 / 407 = 199 J/K

Delta S univ = 152 + 199 = 351 J/K

Part E

delta G = delta H - T delta S

delta G = 34.184 KJ

since delta G is positive ; it is non spontaneous rection

part F

delta G = delta H - T delta Srxn

delta G = -33.912 KJ

since delta G is negative it is spontaneous reaction

Part G

Delta G = 127816 J

since delta G is positve it is non spontaneous reaction

Part H

delta G = -142864 J

since delta G is negative the reaction is spontaneous one

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