热力学第一定律 Benson Group Contributions Group △HP/kJmo1Cpm°JK1mo C(H)2C)-42.17 259 C(H)2C)2-20.7 22.8 C(H)C3 -6.19 18.7 C(C) +8.16 18.2 Example C(C)4 C(H)2C)2 Estimate standard enthalpy of formation for hexane(g& I)at 298 K Decomposition: two C(H)3(C) groups and four C(H)2(C)2 groups △H(C。H1429) 2(-42.17)+4(-20.7 =-167.1kJmo1 △a(CH14)=289kJmo1 △H(CAH 167.1-289 196.0 kJ mol- Experimental:-1987 kJ mol热力学第一定律