Elemental Boron Can Be Formed by Reaction of Boron Trichloride

question 6

Multiple Choice

Elemental boron can be formed 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)
S°(J/K·mol) : ? 130.6 5.87 186.8
If ΔS° = 80.3 J/K for the reaction above, 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

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