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[answered] A large tank is filled with methane gas at a concentration


A large tank is filled with methane gas at a concentration of 0.770 kg/m3. The valve of a 1.80-m pipe connecting the tank to the atmosphere is inadvertently left open for 17.0 hours. During this time, 6.40x10-4kg 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 2.10x10-5m2/s. What is the cross-sectional area of the pipe? Assume that the concentration of methane in the atmosphere is zero.

I keep getting 1.65E-3 meter squared and it is coming up wrong.

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2, but this is not correct.

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