14.14. One of water's most familiar and unusual properties is its negative volume of melting: the density of ice is 917 kg/m3 and liquid water 1000 kg/m3 at the normal melting point. Some other useful properties of water for this problem are: Cpjce38 J/K mol, Cp,liq. water 75 J/K mol, Ahm 6 kJ/mol at 0°C, and MH20 18 g/mol a) It has been claimed that ice skating is possible because the pressure of the blade on the ice lowers its freezing point, induces melting, and provides a slippery liquid layer. What is the expected freezing temperature from a 65 kg person on skates that have a total area in contact with the ice of 30 cm2 (blades 0.5 cm wide and 30 cm long)? Is it likely the ice will actually melt? b) A small amount of solute is added to liquid water at 0 °C and atmospheric pressure at mole fraction xolute pressure until 10% of the original water is present as ice. How much heat must be removed per mole of water, Q/n, to accomplish this task? Assume that the solute contributes negligible heat capacity to the solution. = 0.05. The mixture is then cooled at constant Saudi Aramco: Company General Use
14.14. One of water's most familiar and unusual properties is its negative volume of melting: the density of ice is 917 kg/m3 and liquid water 1000 kg/m3 at the normal melting point. Some other useful properties of water for this problem are: Cpjce38 J/K mol, Cp,liq. water 75 J/K mol, Ahm 6 kJ/mol at 0°C, and MH20 18 g/mol a) It has been claimed that ice skating is possible because the pressure of the blade on the ice lowers its freezing point, induces melting, and provides a slippery liquid layer. What is the expected freezing temperature from a 65 kg person on skates that have a total area in contact with the ice of 30 cm2 (blades 0.5 cm wide and 30 cm long)? Is it likely the ice will actually melt? b) A small amount of solute is added to liquid water at 0 °C and atmospheric pressure at mole fraction xolute pressure until 10% of the original water is present as ice. How much heat must be removed per mole of water, Q/n, to accomplish this task? Assume that the solute contributes negligible heat capacity to the solution. = 0.05. The mixture is then cooled at constant Saudi Aramco: Company General Use
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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Transcribed Image Text:14.14. One of water's most familiar and unusual properties is its negative volume
of melting: the density of ice is 917 kg/m3 and liquid water 1000 kg/m3 at the
normal melting point. Some other useful properties of water for this problem
are: Cpjce38 J/K mol, Cp,liq. water
75 J/K mol, Ahm 6 kJ/mol at 0°C, and
MH20 18 g/mol
a) It has been claimed that ice skating is possible because the pressure of the
blade on the ice lowers its freezing point, induces melting, and provides a
slippery liquid layer. What is the expected freezing temperature from a 65 kg
person on skates that have a total area in contact with the ice of 30 cm2 (blades
0.5 cm wide and 30 cm long)? Is it likely the ice will actually melt?
b) A small amount of solute is added to liquid water at 0 °C and atmospheric
pressure at mole fraction xolute
pressure until 10% of the original water is present as ice. How much heat must
be removed per mole of water, Q/n, to accomplish this task? Assume that the
solute contributes negligible heat capacity to the solution.
= 0.05. The mixture is then cooled at constant
Saudi Aramco: Company General Use
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