Given the values of H rxn, S rxn, and T below, determine S univ. art A H rxn= 90

Question

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

art A

Hrxn= 90 kJ , Srxn= 148 J/K , T= 309 K

Express your answer using two significant figures.

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Part B

Hrxn= 90 kJ , Srxn= 148 J/K , T= 755 K

Express your answer using one significant figure.

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Part C

Hrxn= 90 kJ , Srxn= 148 J/K , T= 309 K

Express your answer using two significant figures.

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Part D

Hrxn= 90 kJ , Srxn= 148 J/K , T= 401 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.

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.

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.

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.

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

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Explanation / Answer

Suniverse = Ssurroundings + Ssystem

Ssystem = Srxn

Ssurroungins = Q/T = -Hrxn/T (i.e. the surroundings always absorbs/release heat that released/absorbed the system respectively) NOTE that HRxn = kj --> J since Srxn is always in J

then

A)

Suniverse = Ssurroundings + Ssystem = 148 + -90000/309 = -143.26 J/K

B)

Suniverse = Ssurroundings + Ssystem = 148 + -90000/755 = -28.79 J/K

C)

Suniverse = Ssurroundings + Ssystem = -148 + -90000/309 = -439.2 J/K

D)

Suniverse = Ssurroundings + Ssystem = +148 + 90000/401 = 372 J/K

E)

If S universe > 0; then it is spontanous

Since Sunive < 0, this is NOT spontanous

F)

Since Sunive < 0, this is NOT spontanous

G)

Since Sunive < 0, this is NOT spontanous

H)

Since Sunive > 0, this is spontanous

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