The rate of evaporation of water from a surface maintained at a temperature of 60°C is 2.71 x 104 kg/s m2. What will be the rate of evaporation of benzene from a similar surface but maintained at 26°C. If the effective film thickness is the same in both the cases. Given: v.p of water at 60°C = 149 mm Hg v.p of benzene at 26°C = 99.5 mm Hg Diffusivity of air-water vapour at 26°C = 2.6 x 10-5 m²/s Diffusivity of air-benzene vapour at 60°C= 0.98 x 10-5 m²/s Atm. pressure in both the cases = 1.013 x 105 N/m2

Introduction to Chemical Engineering Thermodynamics
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Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
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Q-3
CO_ 2
BL 6
Answer the following.
A The rate of evaporation of water from a surface maintained at a
temperature of 60°C is 2.71 x 104 kg/s m². What will be the rate of
evaporation of benzene from a similar surface but maintained at 26°C.
If the effective film thickness is the same in both the cases.
Given:
v.p of water at 60°C = 149 mm Hg
v.p of benzene at 26°C = 99.5 mm Hg
Diffusivity of air-water vapour at 26°C = 2.6 x 10-5 m²/s
Diffusivity of air-benzene vapour at 60°C= 0.98 x 10-5 m²/s
Atm. pressure in both the cases =
1.013 x 105 N/m2
Transcribed Image Text:Q-3 CO_ 2 BL 6 Answer the following. A The rate of evaporation of water from a surface maintained at a temperature of 60°C is 2.71 x 104 kg/s m². What will be the rate of evaporation of benzene from a similar surface but maintained at 26°C. If the effective film thickness is the same in both the cases. Given: v.p of water at 60°C = 149 mm Hg v.p of benzene at 26°C = 99.5 mm Hg Diffusivity of air-water vapour at 26°C = 2.6 x 10-5 m²/s Diffusivity of air-benzene vapour at 60°C= 0.98 x 10-5 m²/s Atm. pressure in both the cases = 1.013 x 105 N/m2
A The rate of evaporation of water from a surface maintained at a
temperature of 60°C is 2.71 x 104 kg/s m². What will be the rate of
evaporation of benzene from a similar surface but maintained at 26°C.
If the effective film thickness is the same in both the cases.
Given:
v.p of water at 60°C = 149 mm Hg
v.p of benzene at 26°C = 99.5 mm Hg
Diffusivity of air-water vapour at 26°C = 2.6 x 10-5 m²/s
Diffusivity of air-benzene vapour at 60°C= 0.98 x 10-5 m2/s
Atm. pressure in both the cases:
1.013 x 105 N/m2
Transcribed Image Text:A The rate of evaporation of water from a surface maintained at a temperature of 60°C is 2.71 x 104 kg/s m². What will be the rate of evaporation of benzene from a similar surface but maintained at 26°C. If the effective film thickness is the same in both the cases. Given: v.p of water at 60°C = 149 mm Hg v.p of benzene at 26°C = 99.5 mm Hg Diffusivity of air-water vapour at 26°C = 2.6 x 10-5 m²/s Diffusivity of air-benzene vapour at 60°C= 0.98 x 10-5 m2/s Atm. pressure in both the cases: 1.013 x 105 N/m2
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