A simple method has been proposed for estimating the state of mixing in a binary solution directly from the radial distribution function. The method has been applied to the estimation of the size of the cluster or aggregate in a binary solution of methanol and carbon tetrachloride. Pure liquid carbon tetrachloride and a binary solution of pentane and carbon tetrachloride have also been studied as reference systems. The number of methanol molecules which form a cluster in the solution at the volume ratio of 8. 5(CCl//4):1. 5(CH//3OH) has been estimated to be about 18, which is in good agreement with an estimate by light scattering.
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