Use the following data of thermodynamic properties to calculate the values of de

Question

Use the following data of thermodynamic properties to calculate the values of delta S rxn for each of the following reactions:

                   delta Hf (kj/mol)                     delta Gf (Kj/mol)                  S (J/mol * K)

CO (g)        -110.5                                       -137.2                                 197.7

O2 (g)          0                                                0                                       205.2

CO2            -393.5                                       -394.4                                  213.8

N2                     0                                            0                                        191.6

H2                     61.4                                       31.8                                    175.0

NH3                  -45.9                                      -16.4                                   192.8

1. 2CO (g) + O2 (g) -------------------->   2 CO2 (g)

Del S rxn = ?

2. N2 (g) + 3 H2 (g) ---------------------------> 2NH3 (g)

Del S rxn = ?

Explanation / Answer

1) Del S rxn = 2*(213.8) - 205.2 - (2*197.7) = -173 J / mole*K

2) Del S rxn = 2*(192.8) - 3*175 - (191.6) = -331 / mole*K

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