Table 2.

Thermodynamic parameters for the reactions of ferric and ferrous cytochrome c with cyanide, at pH 7.0 and 25°C^a

	ΔG kJ/mol kcal/mol	ΔH kJ/mol kcal/mol	ΔS J/mol·K e.u.	TΔS kJ/mol
Ferric cytochrome c	−34.7	4.6	132.0	39.3
	−8.3	1.1	31.5
Ferrous cytochrome c	13.4	41.0	92.4	27.5
	3.2	9.8	22.1
Note: ΔΔG = 48.1kJ/mol (11.5 kcal/mol); ΔΔH = 36.4 kJ/mol; T (ΔΔS) = 11.8 kJ/mol

^aGeorge and Tsou 1952; George 1967; Margalit and Schejter 1973.