Given the values of H rxn, S rxn, and T below, determine S univ. Part A H rxn= 1

Question

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

Part A

Hrxn= 125 kJ , Srxn= 249 J/K , T=294 K .

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Part B

Hrxn= 125 kJ , Srxn= 249 J/K , T=294 K .

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Part C

Hrxn= 125 kJ , Srxn= 249 J/K , T=294 K .

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Part D

Hrxn= 125 kJ , Srxn= 249 J/K , T=552 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.

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

Part A

Hrxn= 125 kJ , Srxn= 249 J/K , T=294 K .

Suniv= J/K

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Part B

Hrxn= 125 kJ , Srxn= 249 J/K , T=294 K .

Suniv= J/K

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Part C

Hrxn= 125 kJ , Srxn= 249 J/K , T=294 K .

Suniv= J/K

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Part D

Hrxn= 125 kJ , Srxn= 249 J/K , T=552 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

Explanation / Answer

Suniv= Ssys + Ssurr

Suniv= Ssys + (Hsurr/T)

Suniv = Ssys + (- Hsys / T)

Suniv = Ssys - (Hsys / T)

PART (A)

Suniv = 249 - (-125000 / 294) = 674. J/K

PART (B)

Suniv = - 249 - (125000/294) = - 674. J/K

PART (C)
Suniv = - 249 - (-125000/294) = + 176. J/K

PART (D)

Suniv = - 249 - ( - 125000/552) = - 22.6 J/K

PART (E)

Spontaneous

PART (F)
Non Spontaneous

PART (G)

Spontaneous

PART (H)
Non Spontaneous

NOTE: For a reaction to be spontaneous, Suniv > 0

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