Chemistry Practice Problems Entropy Practice Problems Solution: Elemental boron can be forrmed by reaction of boro...

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Solution: Elemental boron can be forrmed by reaction of boron trichloride with hydrogen.  BCl3(g) + 1.5H2(g) → B(s) + 3HCl(g) Substance:    BCl3(g)       H2(g)          B(s)         HCl(g) (J/K•mol):          ?            130.6         5.87      186.8   If ΔS°rxn = 80.3 J/K, what is S° for BCl3(g)? A) -18.2   J/K•mol B) 18.2    J/K•mol C) 290.1  J/K•mol D) 355.4  J/K•mol E) 450.6  J/K•mol

Problem

Elemental boron can be forrmed by reaction of boron trichloride with hydrogen. 

BCl3(g) + 1.5H2(g) → B(s) + 3HCl(g)

Substance:    BCl3(g)       H2(g)          B(s)         HCl(g)

(J/K•mol):          ?            130.6         5.87      186.8

 

If ΔS°rxn = 80.3 J/K, what is S° for BCl3(g)?

A) -18.2   J/K•mol

B) 18.2    J/K•mol

C) 290.1  J/K•mol

D) 355.4  J/K•mol

E) 450.6  J/K•mol