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A certain mass of pure ethylene glycol, HOCH2CH2OH, is added to 2.00 kg of water in the cooling system of a car. The vapour pressure of water in the system at 90°C is found to be 457 mm Hg, whereas P°(H2O) is 525.8 mm Hg at 90°C. Note that ethylene glycol is essential non-volatile at this temperature. a. What mass of ethylene glycol had originally been added to the water? Provide full calculations. Note: potentially useful information about water is found on the formula page. b. Why does ethylene glycol dissolve to such high concentrations in water? Explain the molecular-level cause of this solubility. С. Why does this aqueous ethylene glycol solution not have the same vapour pressure as pure water? Explain the molecular-level cause of this difference between solution and pure solvent.

A certain mass of pure ethylene glycol, HOCH2CH2OH, is added to 2.00 kg of water in the cooling system of a car. The vapour pressure of water in the system at 90°C is found to be 457 mm Hg, whereas P°(H2O) is 525.8 mm Hg at 90°C. Note that ethylene glycol is essential non-volatile at this temperature. a. What mass of ethylene glycol had originally been added to the water? Provide full calculations. Note: potentially useful information about water is found on the formula page. b. Why does ethylene glycol dissolve to such high concentrations in water? Explain the molecular-level cause of this solubility. С. Why does this aqueous ethylene glycol solution not have the same vapour pressure as pure water? Explain the molecular-level cause of this difference between solution and pure solvent.

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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A certain mass of pure ethylene glycol, HOCH2CH2OH, is added to 2.00 kg of water in the cooling system of a car. The vapour pressure of water in the system at 90°C is found to be 457 mm Hg, whereas P°(H2O) is 525.8 mm Hg at 90°C. Note that ethylene glycol is essential non-volatile at this temperature. a. What mass of ethylene glycol had originally been added to the water? Provide full calculations. Note: potentially useful information about water is found on the formula page. b. Why does ethylene glycol dissolve to such high concentrations in water? Explain the molecular-level cause of this solubility. С. Why does this aqueous ethylene glycol solution not have the same vapour pressure as pure water? Explain the molecular-level cause of this difference between solution and pure solvent.
Transcribed Image Text:A certain mass of pure ethylene glycol, HOCH2CH2OH, is added to 2.00 kg of water in the cooling system of a car. The vapour pressure of water in the system at 90°C is found to be 457 mm Hg, whereas P°(H2O) is 525.8 mm Hg at 90°C. Note that ethylene glycol is essential non-volatile at this temperature. a. What mass of ethylene glycol had originally been added to the water? Provide full calculations. Note: potentially useful information about water is found on the formula page. b. Why does ethylene glycol dissolve to such high concentrations in water? Explain the molecular-level cause of this solubility. С. Why does this aqueous ethylene glycol solution not have the same vapour pressure as pure water? Explain the molecular-level cause of this difference between solution and pure solvent.
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