Calculate ΔS° for the reaction 4Cr(s) + 3O₂(g) → 2Cr₂O₃(s)

Question

Quizplus · Accepted Answer

To calculate ΔS°, we need to consider the standard molar entropies of the reactants and products. We can find this information in a table of standard entropy values.

Reactants:
4Cr(s) -> 4 mol x 23.8 J/K·mol = 95.2 J/K
3O2(g) -> 3 mol x 205 J/K·mol = 615 J/K

Products:
2CrO3(s) -> 2 mol x 88.3 J/K·mol = 176.6 J/K
We can calculate the entropy change:
ΔS° = ΣS°(products) - ΣS°(reactants)
ΔS° = (2 mol x 88.3 J/K·mol) - (4 mol x 23.8 J/K·mol + 3 mol x 205 J/K·mol)
ΔS° = -548.1 J/K

Calculate ΔS° for the Reaction 4Cr(s) + 3O2(g) → 2Cr2O3(s)

Calculate ΔS° for the Reaction 4Cr(s) + 3O₂(g) → 2Cr₂O₃(s)