Problem: Find ΔS°rxn for the combustion of ammonia to nitrogen dioxide and water vapor. Is the sign of ΔS°rxn as expected?

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Reaction:      4 NH3 + 7 O2 → 4 NO2 + 6 H2O

ΔS° NH3 = 192.8 J/mol▪K

ΔS° O2 = 205.2 J/mol▪K

ΔS° NO2 = 240.1 J/mol▪K

ΔS° H2O = 188.8 J/mol▪K


ΔS°rxn=S°f, prod-S°f, react

Note that we need to multiply each S˚ by the stoichiometric coefficient since S˚ is in J/mol • K.

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Problem Details

Find ΔS°rxn for the combustion of ammonia to nitrogen dioxide and water vapor. Is the sign of ΔS°rxn as expected?

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