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88. Hreacts with the halogens (X2) according to the reaction: Hz(8) + X2(8) = 2 HX(8) where X2 can be Cl2, Brz, or 12. Use the thermodynamic data in Appendix IIB to calculate AH, AS, AG®, and K, for the reaction between hydrogen and each of the three halogens. Which reac- tion is most spontaneous? Least spontaneous? What is the main factor responsible for the difference in the spontaneity of the three reactions? Does higher temperature make the reactions more spontaneous or less spontaneous?
87. Ethene (C2H4) can be halogenated by the reaction: C2H4(8) + X2(g) = C2H4X2(8) where X2 can be Cl2, Br2, or 12. Use the thermodynamic data given to calculate AH, AS, AG®, and K, for the halogenation reaction by each of the three halogens at 25°C. Which reaction is most spontaneous? Least spontaneous? What is the main fac- tor responsible for the difference in the spontaneity of the three reactions? Does higher temperature make the reactions more spontaneous or less spontaneous? Compound AH; (kJ/mol) Sº (J/mol ·K) 308.0 C2H4Cl2(g) -129.7 +38.3 C2H4Br2(g) C2H412(g) 330.6 347.8 +66.5