Answered: a) Calculate the molality of the…

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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Sucrose solution for experiment 1: (Question a-c)
Prepare a solution of sucrose by accurately weighing 9.0 – 9.25 g of sucrose into a 100mL
beaker / conical flask. Record the mass of the sample. Add 25 mL distilled water. Mix until all
crystals dissolve.
NaCl solution for experiment 2: (Question d-f)
Prepare a solution of NaCl by accurately weighing approximately 1.5 g of NaCl into a 100 mL
beaker / conical flask. Record the mass of the sample. Add 25 mL distilled water. Mix until all
crystals dissolve.
MgCl2٠6H2O solution for experiment 2: (Question d-f)
Prepare a solution of magnesium chloride by accurately weighing approximately 3.6 g of
MgCl2٠6H20 into a 100 mL beaker / conical flask. Record the mass of the sample. Add 25 mL
distilled water. Mix until all the crystals dissolve

d.) Calculate the molality of the Nace and
12
MgCe2.6H20 solutions.
10-
4
AV
2.
-2
.............
H20
-4
Time (s)
Na CI
Figure 2: Cooling curves for pure water, an
aqueous sodium chloride and an aqueous
magnesium chloride solution.
e.) Calculate the total mass of water
f.) Calculate the molality of MgCe2.
(solvent) in kg:
i.)
Mass of crystal water added (kg):
ii)
Mass of water added (kg):
iii)
Total mass of water added (kg):
(3) dwal

a) Calculate the molality of the aqueous
sucrose solution. (Density of water = 1 g/cm³)
10
6.
2.
H2O
Sucrose
Time (s)
Figure 1: Cooling curves for pure water and an
aqueous sucrose solution.
b.) Calculate the freezing point depression c.) Calculate the molar fraction of the
constant (Kfp) of water. (units: °C-kg-mol4)
sucrose in water.
(5) d

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