Skip to main content
. 2023 Jun 13;19(12):3652–3663. doi: 10.1021/acs.jctc.3c00265

Table 1. Different Expressions for Gibbs Free Energy of Formation of Octadecane.

  ΔGf (kcal/mol)
Deviation from database
Equation 298 K 1000 K 298 K 1000 K
ΔGf,1 = ΔHf,grnd – TSRRHO,grnd –149.5 –331.5 10.9 (6.8%) 46.1 (12.2%)
ΔGf,2 = Δf – TS̅RRHO –150.7 –344.2 9.6 (6.0%) 33.4 (8.9%)
ΔGf,3 = ΔHf,grnd – T(SRRHO,grnd + Sconf) –158.3 –361.3 2.0 (1.3%) 16.3 (4.3%)
ΔGf,4 = Δf – T(RRHO + Sconf) –159.6 –373.8 0.8 (0.5%) 3.8 (1.0%)
Burcat’s database –160.4 –377.6