(a) Explain why the diffusion coefficient of CH₃OH is greater than that of sucrose in Table 23-1.

(b) Make an order-of-magnitude estimate of the diffusion coefficient of water vapor in air at 298 K.

Table 23-1

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TABLE 23-1 Representative diffusion coefficients at 298 K Solute Solvent Diffusion coefficient (m/s) 2.3 x 10 0.52 x 10 H,O H,O H,0 H,O H,O Sucrose Glycine CH,OH 1.1 X 10 1.6 X 10-9 Ribonuclease (FM 13 700) H,O (293 K) 0.12 x 10-9 Serum albumin (FM 66 000) Н.О (293 К) 0.059 X 10 4.0 x 10 3.2 x 10-9 Hexane CCI, N2 CS-(g) O(g) H* Неptane CCI, Air (293 K) Air (273 K) 3.4 x 10 1.0 x 10 1.8 x 10-5 9.3 x 10 5.3 x 10 H,0 H,0 H,0 H,O H,0 H,O H,O OH Li* 1.0 X 10 1.3 x 10 2.0 x 10 2.0 x 10-9 2.0 x 10-9 Na+ K+ CI