Problem: Calculate ∆S°for the reaction4Cr(s)      +      3O2(g)      →      2Cr2O3(s)Substance:                 Cr(s)              O2(g)               Cr2O3(s)S°(J/K⋅mol):                 23.77            205.138              81.2A) –548.1 J/KB) –147.7 J/KC) 147.7 J/KD) 310.1 J/KE) 548.1 J/K

FREE Expert Solution

We’re being asked to determine the ∆S°for the reaction:


4 Cr(s) + 3 O2(g) → 2 Cr2O3(s)


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


ΔS°rxn=S°f, prod-S°f, react


Given: 

Substance:                 Cr(s)              O2(g)               Cr2O3(s)

S°(J/K⋅mol):                 23.77            205.138              81.2


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Problem Details

Calculate ∆S°for the reaction

4Cr(s)      +      3O2(g)      →      2Cr2O3(s)

Substance:                 Cr(s)              O2(g)               Cr2O3(s)

S°(J/K⋅mol):                 23.77            205.138              81.2

A) –548.1 J/K

B) –147.7 J/K

C) 147.7 J/K

D) 310.1 J/K

E) 548.1 J/K

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Entropy concept. You can view video lessons to learn Entropy. Or if you need more Entropy practice, you can also practice Entropy practice problems.