Elemental boron can be formed by reaction of boron trichlori…

Elemental boron can be formed by reaction of boron trichloride with hydrogen. BCl3 (g) + 1.5 H2 (g) B (s) + 3 HCl (g) So(H2, g) = 130.6 J/K mol  So(B, s) = 5.87 J/K mol So(HCl, g) = 186.8 J/K mol If So(reaction) = 80.3 J/K for the reaction above, what is So for BCl3 (g)?