Table 2 Thermodynamic parameters and Gibbs free energies for anaerobic benzoate and hexadecane degradation scenarios

Substrates	Reaction types	Reactions	ΔG^o (kJ)	ΔH^o (kJ)	ΔG (kJ)^a
Hexadecane	1. Hydrogenogenic oxidation	C₁₆H₃₄ + 16H₂O → 8CH₃COO⁻ + 17H₂ + 8 H⁺	1089.1	1069.8	753.3
	2. Acetogenic oxidation	C₁₆H₃₄ + 8.5HCO₃⁻ → 12.25CH₃COO⁻ + 3.75 H⁺ + H₂O	176.3	98.4	133.9
	3. Complete oxidation	C₁₆H₃₄ + 12.25SO₄²⁻ → 16HCO₃⁻ + 12.25HS⁻ + H₂O + 3.75 H⁺	−407.3	24.9	−653.3
Benzoate	4. Hydrogenogenic oxidation	C₇H₅O₂⁻ + 7H₂O → 3CH₃COO⁻ + HCO₃⁻ + 3 H₂ + 3H⁺	120.9	117.4	12.8
	5. Acetogenic oxidation	C₇H₅O₂⁻ + 0.5HCO₃⁻ → 3.75CH₃COO⁻ + 2.25 H⁺	−846.3	−1091.3	−950.3
	6. Complete oxidation	C₇H₅O₂⁻ + 3.75SO₄²⁻ + 4H₂O → 7HCO₃⁻ + 3.755HS⁻ + 2.25 H⁺	−76.2	29.4	−230.7

^aThe Gibbs free energies were calculated for deep-sea conditions of 4 °C, 300 atm, pH 8 and 2 mM bicarbonate concentrations³¹

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