Final answer:
To calculate ΔS° for the reaction N2(g) + 2O2(g) → 2NO2(g), sum up the standard entropy values for the products and subtract the sum of the entropy values for the reactants, using stoichiometric coefficients to multiply each substance's entropy value.
Step-by-step explanation:
The calculation of the standard entropy change (ΔS°) for the reaction N2(g) + 2O2(g) → 2NO2(g) requires using standard entropy values (S°) for each of the reactants and products that can be found in thermodynamic data tables. The ΔS° for a reaction can be calculated using the formula:
ΔS° = ∑ S°(products) - ∑ S°(reactants)
Where:
- ∑ S°(products) is the sum of the standard entropy values of the products, each multiplied by their respective stoichiometric coefficients.
- ∑ S°(reactants) is the sum of the standard entropy values of the reactants, each multiplied by their respective stoichiometric coefficients.
To find the actual values, you would look up the standard entropy (S°) for each substance: N2(g), O2(g), and NO2(g) from a reliable source such as a textbook or a chemistry database. After obtaining these values, you would substitute them into the formula above to calculate ΔS°.