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Calculate the partial pressure of helium gas for a volume of 1.0 x 10^-6 m³ of ²²²₈₆Rn gas after 6 days. The radon gas was originally placed in an evacuated container at 1.0 atm, and the temperature remains constant at 0°C. What is the partial pressure of the radon gas after 6 days? (t_1/2 = 3.82 d for ²²²Rn)

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