The mean free path for methane is $4\mathrm{.}86*10^-8$ at a temperature of $284$ K and a pressure of $1\mathrm{.}73*10^5*$ Pa Find the effective radius r in unit Of angstrom $(1$A$=10^-10$ m$)$ of the methane molecule $.$ Give your answer to the nearest $0\mathrm{.}01$A

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