例6.计算反应：C6H6(g)+3H2(g)=C6H12(g)在125℃下 的△H? ·已知：在298K,1大气压下： AH(H2,g)=-241.8kJ/mol; ·△.Hm(C6H6,g)=-3169.5kJ/mol;△cHm(C6H12g)=-3688.9kJ/mol. ·各物质的热容为： Cp,m(C6H6g)=11.72+0.2469T; 。 Cp,m(H2g)=28.87; Cp,m(C6H12g)=10.88+0.4017T ·解：由物质的燃烧热求反应热： 。△Hm(298K)=△eHm(C6H6,g)+3△Hm(H2,g)-△.Hm(C6H12g) ● =-3169.5-3×241.8+(-3688.9) ● =-206 kJ/mol △Cp,m=10.88+0.4017T-11.72-0.2469T-3×28.87 ● =-87.45+0.1548T• 例6. 计算反应: C6H6 (g)+3H2 (g)=C6H12(g) 在125℃下 的H? • 已知:在298K,1大气压下: cHm(H2 ,g)=-241.8kJ/mol; • cHm(C6H6 ,g)=-3169.5kJ/mol; cHm(C6H12,g)=-3688.9kJ/mol. • 各物质的热容为: Cp,m(C6H6 ,g)=11.72+0.2469T; • Cp,m(H2 ,g)=28.87; Cp,m(C6H12,g) =10.88+0.4017T • 解: 由物质的燃烧热求反应热: • rHm(298K)=cHm(C6H6 ,g)+3cHm(H2 ,g)-cHm(C6H12,g) • =-3169.5-3×241.8+(-3688.9) • =-206 kJ/mol • rCp,m=10.88+0.4017T-11.72-0.2469T-3×28.87 • =-87.45+0.1548T