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He (g) is stored in a Pyrex sphere (ri= 100 mm; l= 10 mm) at 25°C,...

He (g) is stored in a Pyrex sphere (ri= 100 mm; l= 10 mm) at 25°C, 4 bars. How fast is the gas leaking out of the container? You may take the properties of this system to be D(He-SiO2)=0.4*10^-13 m^2/s, S(He-SiO2) 298K=0.45*10^-3 kmol/m^3 bar

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