Problem: Calculate ΔS°rxn for the reaction 2 NO(g) + O2(g) → 2 NO2(g).SubstanceS° (J/mol⋅K)NO2240.0O2205.2NO210.8

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We’re being asked to determine the equilibrium constant (K) at 298 K for the given reaction:

2 NO(g) + O2(g) → 2 NO2(g)


We can use the following equation to solve for ΔS˚rxn:


ΔS°rxn=S°f, prod-S°f, react

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Problem Details

Calculate ΔS°rxn for the reaction 2 NO(g) + O2(g) → 2 NO2(g).

SubstanceS° (J/mol⋅K)
NO2240.0
O2205.2
NO210.8

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