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b) A solution of 500 kg of NazSO4 in 2500 kg water is cooled from 333 K to 283 K in an agitated mild steel vessel of mass 750 kg. At 283 K, the solubility of the anhydrous salt is 8.9 kg/100 kg water and the stable crystalline phase is NazSO4.10H20. At 291 K, the heat of the solution is -78.5 MJ/kmol and the specific heat capacities of the solution and mild steel are 3.6 and 0.5 kJ/kg deg K respectively. During cooling, 2 percent of the water initially present is lost by evaporation. Determine the heat which must be removed. Given: The molecular mass of the hydrate = 322 kg/kmol Molecular mass of NazSO4 = 142 kg/kmol Latent heat of vaporization of water = 2395 kJ/kmol

b) A solution of 500 kg of NazSO4 in 2500 kg water is cooled from 333 K to 283 K in an agitated mild steel vessel of mass 750 kg. At 283 K, the solubility of the anhydrous salt is 8.9 kg/100 kg water and the stable crystalline phase is NazSO4.10H20. At 291 K, the heat of the solution is -78.5 MJ/kmol and the specific heat capacities of the solution and mild steel are 3.6 and 0.5 kJ/kg deg K respectively. During cooling, 2 percent of the water initially present is lost by evaporation. Determine the heat which must be removed. Given: The molecular mass of the hydrate = 322 kg/kmol Molecular mass of NazSO4 = 142 kg/kmol Latent heat of vaporization of water = 2395 kJ/kmol

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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b) A solution of 500 kg of NazSO4 in 2500 kg water is cooled from 333 K to 283 K in an agitated mild steel vessel of mass 750 kg. At 283 K, the solubility of the anhydrous salt is 8.9 kg/100 kg water and the stable crystalline phase is NazSO4.10H20. At 291 K, the heat of the solution is -78.5 MJ/kmol and the specific heat capacities of the solution and mild steel are 3.6 and 0.5 kJ/kg deg K respectively. During cooling, 2 percent of the water initially present is lost by evaporation. Determine the heat which must be removed. Given: The molecular mass of the hydrate = 322 kg/kmol Molecular mass of NazSO4 = 142 kg/kmol Latent heat of vaporization of water = 2395 kJ/kmol
Transcribed Image Text:b) A solution of 500 kg of NazSO4 in 2500 kg water is cooled from 333 K to 283 K in an agitated mild steel vessel of mass 750 kg. At 283 K, the solubility of the anhydrous salt is 8.9 kg/100 kg water and the stable crystalline phase is NazSO4.10H20. At 291 K, the heat of the solution is -78.5 MJ/kmol and the specific heat capacities of the solution and mild steel are 3.6 and 0.5 kJ/kg deg K respectively. During cooling, 2 percent of the water initially present is lost by evaporation. Determine the heat which must be removed. Given: The molecular mass of the hydrate = 322 kg/kmol Molecular mass of NazSO4 = 142 kg/kmol Latent heat of vaporization of water = 2395 kJ/kmol
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