Problem: Consider the reaction of N2O5 at 25°C for which the following data are relevant: 2 N2O5 (g) → 4 NO2 (g) + O2 (g) Substance             ΔH°f                               S°              N 2O5                    11.29 kJ/mol             355.3 J/K mol               NO 2                     33.15 kJ/mol             239.9 J/K mol               O 2                                   ?                     204.8 J/K mol   What is ΔS° for the reaction (in J/K)? a) 89.5 b) 249.2 c) 453.8 d) 249.2 e) -115.6

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Problem Details

Consider the reaction of N2O5 at 25°C for which the following data are relevant:

2 N2O(g) → 4 NO(g) + O(g)

Substance             ΔH°f                               S°

             N 2O5                    11.29 kJ/mol             355.3 J/K mol

              NO 2                     33.15 kJ/mol             239.9 J/K mol

              O 2                                   ?                     204.8 J/K mol

What is ΔS° for the reaction (in J/K)?

a) 89.5

b) 249.2

c) 453.8

d) 249.2

e) -115.6

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