how much heat have to be removed from the system for the dilute product to emerge at 100 F

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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Pure water is used to dilute 152 lbm of a sulfuric acid stream that has an initial mass fraction of H2SO4 equal to 0.85 in order to produce a diluted acid with an H2SO4 mass fraction of 0.45 . The temperature of the water is 40 °F and that of the concentrated acid is 77 °F.

An enthalpy-composition diagram for the system is shown below.

how much heat have to be removed from the system for the dilute product to emerge at 100 F?

|Q| = Btu 

Ĥ(Btu/lbm solution)
100
80
60
40
20
-20
-40
-60
-80
-100
-120
-140
0
0.10 0.20 0.30
32°F
60
40
200°F
80
0.40 0.50 0.60
Mass fraction of H₂SO4
0.70
Freezing line
0.80 0.90 1.00
Transcribed Image Text:Ĥ(Btu/lbm solution) 100 80 60 40 20 -20 -40 -60 -80 -100 -120 -140 0 0.10 0.20 0.30 32°F 60 40 200°F 80 0.40 0.50 0.60 Mass fraction of H₂SO4 0.70 Freezing line 0.80 0.90 1.00
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