The self-diffusion coefficient of radioactive ³H2O in ordinary water (M =18.0×10³ kg mol-') at 25°C is 2.44 x10→ m² s-!. For ordinary water, the density is 0.997×10³ kg m³³, and the viscosity is 0.891×10-³ kg m¯' s- What is the collision diameter of ³H2O ?

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