The diffusion co-efficient in m2/s. of acetic acid in benzene (liquid in liquid) is
A. 2.09 × 10-4
B. 2.09 × 10-5
C. 2.09 × 10-9
D. 2.09 × 10-12
Answer: Option A
This Question Belongs to Chemical Engineering >> Mass Transfer
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Related Questions on Mass Transfer
A. Chemical properties
B. Physical properties
C. Degree of turbulence
D. Interfacial area
A. No change in theoretical
B. Marginal decrease in the number of
C. Major decrease in the number of
D. None of these
The correct answer is: B. 2.09 × 10⁻⁵ m²/s
Explanation:
Diffusion coefficients (D) in liquid–liquid systems are generally much lower than in gases, due to the higher density and intermolecular interactions in liquids.
Typical values for liquid-phase diffusion coefficients lie in the range of 10⁻⁹ to 10⁻⁴ m²/s, with most common organic solute–solvent pairs around 10⁻⁵ m²/s.
For acetic acid in benzene, experimental data and literature report a diffusion coefficient of approximately:
𝐷
≈
2.09
×
10
−
5
m
2
/
s
D≈2.09×10
−5
m
2
/s
✅ Final Answer: B. 2.09 × 10⁻⁵