|(II) Estimate the time needed for a glycine molecule (see Table 13–4) to diffuse a distance of 25 µm in water at 20°C if its concentration varies over that distance from 1.00 mol/m³ to 0.50 mol/m³? Compare this “speed" to its rms (thermal) speed. The molecular mass of glycine is about 75 u.

|(II) Estimate the time needed for a glycine molecule (see Table 13–4) to diffuse a distance of 25 µm in water at 20°C if its concentration varies over that distance from 1.00 mol/m³ to 0.50 mol/m³? Compare this “speed" to its rms (thermal) speed. The molecular mass of glycine is about 75 u.

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter1: Units And Measurement

Section: Chapter Questions

Problem 57P: Assuming the human body is primarily made of water, estimate the number of molecules in it. (Note...

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Question

(II) Estimate the time needed for a glycine molecule (see
Table 13–4) to diffuse a distance of 25 µm in water at 20°Cif
its concentration varies over that distance from 1.00 mol/m³
to 0.50 mol/m³? Compare this “speed" to its rms (thermal)
speed. The molecular mass of glycine is about 75 u.

TABLE 13-4 Diffusion
Constants, D (20°C, 1 atm)
Diffusing
Molecules
Medium D (m²/s)
H2
Air
6.3 x 10-5
O2
Air
1.8 x 10-5
Water 100 X 10¬11
O2
Glycine (an
amino acid) Water
95 × 10-1
Blood
hemoglobin Water
DNA (mass
6 X 10° u) Water 0.13 × 10-11
6.9 × 10-11

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