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.

He loss rate (kg/s)
= (area)*(He density)*(D/t)
D is the diffusion coefficient
t is the wall thickness in meters
= (0.17)*(0.72)*(4.9*10^9)/3.09*10^4
= 1.94*10^6 kg/sec
= 1.94*10^3 g/s = 7.0 g/hr
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