Use the data from this table of thermodynamic properties to calculate the values of delta S°rxn for each of the following reactions at 25 °C.
(a) 4NH3 (g) + 7O2 (g) → 4NO2 (g) + 6H2O (g)
(b) N2 (g) + O2 (g) → 2NO (g)
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