The diffusion constant for the amino acid glycine in water is 1.06 × 10-9 m2/s. In a 2.0-cm-long tube with a cross-secti

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The diffusion constant for the amino acid glycine in water is1.06 × 10-9 m2/s. In a 2.0-cm-long tubewith a cross-sectional area of 1.4 ×10-4 m2, the mass rate of diffusionis m/t = 4.2 × 10-14 kg/s,because the glycine concentration is maintained at a valueof 8.4 × 10-3 kg/m3 atone end of the tube and at a lower value at the other end. What isthe lower concentration?