Calculate ΔS°rxn for the following reaction:
4Cr(s) + 3O2(g) → 2Cr2O3(s).
Substance ΔS°, J/K·mol
a. 548.1 J/K
b. 147.7 J/K
c. -147.7 J/K
d. -548.1 J/K
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