Question

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Given the values of ΔH∘rxn, ΔS∘rxn, and T below, determine ΔSuniv. Predict whether or not each...

Given the values of ΔH∘rxn, ΔS∘rxn, and T below, determine ΔSuniv.

Predict whether or not each reaction will be spontaneous.

ΔH∘rxn=− 118 kJ , ΔS∘rxn= 261 J/K , T= 294 K
ΔSuniv = ??? (J/K)

ΔH∘rxn= 118 kJ , ΔS∘rxn=− 261 J/K , T= 294 K .

ΔSuniv = ??? (J/K)

ΔH∘rxn=− 118 kJ , ΔS∘rxn=− 261 J/K , T= 294 K .

ΔSuniv = ??? (J/K)

ΔH∘rxn=− 118 kJ , ΔS∘rxn=− 261 J/K , T= 565 K .

ΔSuniv = ??? (J/K)

Solutions

Expert Solution

ANSWER :     (S)universe = (S)system + (S)surrounding [From thermodynamics]

                       (S)system = +261KJ/mol ; (S)surrounding = [(- H)system] / T & Hsystem = -118KJ/mol

                                                                                                                                      T = temperature = 294 K

        ==> (S)universe = 261 + - (-118) /294 = 261 + 118/294

                                        = 261 + 0.401 =261.401 KJ/mol

              (S)universe = 261.401 KJ/mol { in this case reaction is not spontaneous as entopychange is positive}     

queen_honey_blossom answered 2 years ago
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