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A latex balloon, wall thickness 3.091 x 104 m, contains helium at a concentration of 0.23 kg m3. Under these conditions the total surface area of the balloon is 0.46 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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Elena,
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