Given the values of ? H ?rxn, ? S ?rxn, and T below, determine ? S univ. ? H ?rx

Question

Given the values of ?H?rxn, ?S?rxn, and T below, determine ?Suniv.

?H?rxn=? 132 kJ , ?S?rxn= 248 J/K , T= 302 K .

?H?rxn= 132 kJ , ?S?rxn=? 248 J/K , T= 302 K .

?H?rxn=? 132 kJ , ?S?rxn=? 248 J/K , T= 302 K .

?H?rxn=? 132 kJ , ?S?rxn=? 248 J/K , T= 561

Given the values of ?H?rxn, ?S?rxn, and T below, determine ?Suniv.

?H?rxn=? 132 kJ , ?S?rxn= 248 J/K , T= 302 K .

?H?rxn= 132 kJ , ?S?rxn=? 248 J/K , T= 302 K .

?H?rxn=? 132 kJ , ?S?rxn=? 248 J/K , T= 302 K .

?H?rxn=? 132 kJ , ?S?rxn=? 248 J/K , T= 561

Explanation / Answer

Solution:- Suniverse = Ssystem + Ssurroundings

Ssurroundings = -delta H/T  

delta H is given as 132 kJ that is 132000 J and T is given as 302 K.

So, Ssurroundings = -132000 J/302 K = -437 J/K

Ssystem is given as 248 J/K.

So, Suniverse = -437 J/K + 248 J/K

Suniverse = -189 J/K

Values are same for the first three sets.

For the last set of information,

Ssurroundings = -132000J/561 K  

Ssurroundings = -235 J/K

Suniverse = -235 J/K + 248 J/K

Suniverse = 13 J/K

Calculations shows that Only set shows a spontaneous reaction as the entropy change for universe for this is positive.

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