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A large tank is filled with methane gas at a concentration of 0.690 kg/m3 The valve of a 1.37-m pipe connecting the tank to the atmosphere is inadvertently left open for eleven hours. During this time, 8.50 multiply.gif 10-4 kg of methane diffuses out of the tank, leaving the concentration of methane in the tank essentially unchanged. The diffusion constant for methane in air is 2.13 multiply.gif 10-5 m2/s. What is the cross-sectional area of the pipe? Assume that the concentration of methane in the atmosphere is zero.

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