Chemical equilibrium in argon: Anomaly of density dependence of dimerization reaction in the medium density region

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Abstract
We studied the dimerization equilibrium of 2‐methyl‐2‐nitrosopropane in argon at 25.0 °C from about 500 to 1200 kg m−3. It is clarified that in the simplest solvent, argon, there exists a definite difference in the density dependence of the equilibrium constant between the high and medium density regions. In the high density region, the equilibrium constant shows a sizable increase with the solvent density as in the liquid phase. Near the critical density, however, the equilibrium constant shows little density dependence.