The equilibrium constants, enthalpy, and entropy of the reversible binding of nitrogen oxide to Fe(II)edta in an aqueous solution have been measured in the temperature range 38.5 to 70 °C. Experiments were carried out by absorbing NO under O2 free conditions. The results show that, in the absorption of NO with Fe(II)edta solution, the value of ΔH° is −15.8 kcal/mol and ΔS° is −20.7 e.u.
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