physics
posted by Anonymous .
A latex balloon, wall thickness 3.091 x 104 m, contains helium at a concentration of 0.72 kg m3. Under these conditions the total surface area of the balloon is 0.17 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 109 m2s1. Calculate the rate of helium effusion (in g/hr) from the balloon.
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