Calculate the standard entropy, deltaSdegree r times n, of the following reactio

Question

Calculate the standard entropy, deltaSdegree r times n, of the following reaction at 25.0 degreeC using the data in this table. The standard enthalpy of the reaction. deltaHdegree r times n, is -633.1 kJ- mol^-1. 3C2 H2 (g) rightarrow C6 H6 (l) deltaS degree = Then, calculate the standard Gibbs free energy of the reaction, AG degree r times n. deltaG degree r times n = Finally, determine which direction the reaction is spointaneous as written at 25.0 degreeC and standard pressure. forward reverse both neither

Explanation / Answer

Srxn = Sproducts - Sreactants

Sproducts = 45.56 J/(mol K) (for benzene)

Sreactants = 200.8   J/(mol K) (for ethylene)

Srxn = 45.56 -3*200.8 = -556.84 J/molK

Srxn = -556.84 J/molK

dGrxn = Hrxn - T*Srxn = -633.1 - 298*(556.84/1000) = -799.04 J/molK

If G<0, then this reaction is spontaneous

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