Calculate the standard entropy change for the following reaction.
(J/mol.K)
A) -198.7 J/K.mol-rxn
B) 198.7 J/K.mol-rxn
C) 184.3 J/K.mol-rxn
D) -184.3 J/K.mol-rxn
E) -129.8 J/K.mol-rxn

Question

Calculate the standard entropy change for the following reaction.
  (J/mol.K)
A) -198.7 J/K.mol-rxn 
B) 198.7 J/K.mol-rxn 
C) 184.3 J/K.mol-rxn 
D) -184.3 J/K.mol-rxn 
E) -129.8 J/K.mol-rxn

Quizplus · Accepted Answer

The standard entropy change of the reaction can be calculated using the equation ΔS°rxn = ΣS°products - ΣS°reactants. The values for standard molar entropies can be found in a table or online database. Using this equation and the given chemical equation, the entropy change can be calculated to be -198.7 J/KF1F1F1S1F1F1F10mol-rxn. Therefore, the best choice is A.

Calculate the Standard Entropy Change for the Following Reaction