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1. Say we accidentally left the cover off of a test tube containing liquid benzene. The cylindrical test tube is 10 cm tall and 1.5 cm in diameter. Initially, the tube is 60% full of benzene. How long will it take for all of the benzene to evaporate (keep in mind that the flux will change as the benzene level falls). Assume transfer to the top of the tube is due only to molecular diffusion (so no convective transfer) and that the concentration at the top of the tube (= room air) is zero. The temperature is 25 °C, the pressure is 1 atm, the diffusion coefficient of benzene in air is 0.0962 cm²/s, the density of liquid benzene is 0.87 g/cm³, and its saturation vapor pressure at 25 °C is 0.126 atm.

1. Say we accidentally left the cover off of a test tube containing liquid benzene. The cylindrical test tube is 10 cm tall and 1.5 cm in diameter. Initially, the tube is 60% full of benzene. How long will it take for all of the benzene to evaporate (keep in mind that the flux will change as the benzene level falls). Assume transfer to the top of the tube is due only to molecular diffusion (so no convective transfer) and that the concentration at the top of the tube (= room air) is zero. The temperature is 25 °C, the pressure is 1 atm, the diffusion coefficient of benzene in air is 0.0962 cm²/s, the density of liquid benzene is 0.87 g/cm³, and its saturation vapor pressure at 25 °C is 0.126 atm.

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
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
Section: Chapter Questions
Problem 1.1P
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1. Say we accidentally left the cover off of a test tube containing liquid benzene. The cylindrical test tube is 10 cm tall and 1.5 cm in diameter. Initially, the tube is 60% full of benzene. How long will it take for all of the benzene to evaporate (keep in mind that the flux will change as the benzene level falls). Assume transfer to the top of the tube is due only to molecular diffusion (so no convective transfer) and that the concentration at the top of the tube (= room air) is zero. The temperature is 25 °C, the pressure is 1 atm, the diffusion coefficient of benzene in air is 0.0962 cm²/s, the density of liquid benzene is 0.87 g/cm³, and its saturation vapor pressure at 25 °C is 0.126 atm.
Transcribed Image Text:1. Say we accidentally left the cover off of a test tube containing liquid benzene. The cylindrical test tube is 10 cm tall and 1.5 cm in diameter. Initially, the tube is 60% full of benzene. How long will it take for all of the benzene to evaporate (keep in mind that the flux will change as the benzene level falls). Assume transfer to the top of the tube is due only to molecular diffusion (so no convective transfer) and that the concentration at the top of the tube (= room air) is zero. The temperature is 25 °C, the pressure is 1 atm, the diffusion coefficient of benzene in air is 0.0962 cm²/s, the density of liquid benzene is 0.87 g/cm³, and its saturation vapor pressure at 25 °C is 0.126 atm.
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