Consider the following table of thermodynamic data. All valuesare tabulated for

Question

Consider the following table of thermodynamic data. All valuesare tabulated for 25 C. C2H2 (g) 209 201
C2H4 (g) 68 219
C2H6 (g) -33 230
H2 (g) 0 131
H2O (g) -229 189
C2H5OH -175 161
C2H2 (g) + 2H2 (g) --> C2H6 (g)

A) -173 b) 236 c) -311 d) -248 I've tried doing this about 6 times over two days and can't comeclose. Pls help Consider the following table of thermodynamic data. All valuesare tabulated for 25 C. Subs. G degree f(KJ/mol) S degree (J/mol-k) C2H2 (g) 209 201 C2H4 (g) 68 219 C2H6 (g) -33 230 H2 (g) 0 131 H2O (g) -229 189 C2H5OH -175 161 What is the value of H degree (in KJ) for the reaction describedbelow? Assume the reaction is performed at 25 C. C2H2 (g) + 2H2 (g) -- > C2H6 (g) A) -173 b) 236 c) -311 d) -248

Explanation / Answer

                  C2H2 (g) + 2H2 (g) --> C2H6 (g)        Gorxn =  GofC2H6(g) - [Gof C2H2(g) +2Gof H2(g) ]                      = -33 kJ/mol - [ 209 kJ/mol + 2 * 0]                     =   - 242 kJ/mol         Sorxn = SofC2H6(g) - [Sof C2H2(g) +2Sof H2(g) ]                      = 230 J/K.mol - [ 201 J/K.mol + 2*131 J/K.mol]                    = -233 J/K.mol         Gorxn =   Horxn - TSorxn        -242 kJ/mol = Horxn- 298K * (-233 x 10-3 J/K.mol)             Horxn  = -311.4 kJ/mol          Theanswer is c)      
                    

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