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Hydrogen in solution in a thick slab of nickel is removed by subjecting one face of the slab to a vacuum at 600°C. a) If the initial concentration of H in the nickel is 8 g mol m-3, after what time is the local concentration of H at a depth of 10-3 m below the surface equal to 4 g mol m-³? b) After this diffusion time, what is the flux of hydrogen from the surface? c) How much hydrogen has been removed from the slab per unit area? For hydrogen in nickel, DH = 7.77 x 10-7 exp -41200 RT m² 8-1

Hydrogen in solution in a thick slab of nickel is removed by subjecting one face of the slab to a vacuum at 600°C. a) If the initial concentration of H in the nickel is 8 g mol m-3, after what time is the local concentration of H at a depth of 10-3 m below the surface equal to 4 g mol m-³? b) After this diffusion time, what is the flux of hydrogen from the surface? c) How much hydrogen has been removed from the slab per unit area? For hydrogen in nickel, DH = 7.77 x 10-7 exp -41200 RT m² 8-1

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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Hydrogen in solution in a thick slab of nickel is removed by subjecting one face of the slab to a vacuum at 600°C. a) If the initial concentration of H in the nickel is 8 g mol m-3, after what time is the local concentration of H at a depth of 10-3 m below the surface equal to 4 g mol m-³? b) After this diffusion time, what is the flux of hydrogen from the surface? c) How much hydrogen has been removed from the slab per unit area? For hydrogen in nickel, DH = 7.77 x 10-7 exp -41200 RT T m² s-1
Transcribed Image Text:Hydrogen in solution in a thick slab of nickel is removed by subjecting one face of the slab to a vacuum at 600°C. a) If the initial concentration of H in the nickel is 8 g mol m-3, after what time is the local concentration of H at a depth of 10-3 m below the surface equal to 4 g mol m-³? b) After this diffusion time, what is the flux of hydrogen from the surface? c) How much hydrogen has been removed from the slab per unit area? For hydrogen in nickel, DH = 7.77 x 10-7 exp -41200 RT T m² s-1
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