| The sublimation of zinc (mass per mole = 0.0654 kg/mol) takes place at a temperature of 6.00 × 10² K, and the latent heat of sub- limation is 1.99 × 10º J/kg. The pressure remains constant during the sublimation. Assume that the zine vapor can be treated as a monatomie ideal gas and that the volume of solid zinc is negligible compared to the corresponding vapor. Concepts: (i) What is sublimation, and what is the latent heat of sublimation? (ii) When a solid phase changes to a gas phase, does the volume of the material increase or decrease, and by how much? (iii) As the material changes from a solid to a gas, does it do work on the environment, or does the environment do work on it? How much work is involved? (iv) In this problem we begin with heat Q and realize that it is used for two purposes: First, it makes the solid change into a gas, which entails a change AU in the internal energy of the material, AU = Ugus - Usolid. Second, it allows the expanding material to do work W on the environment. According to the conservation-of-energy princi- ple, how is Q related to AU and W? (v) According to the first law of ther- modynamics, how is Q related to AU and W? Calculations: What is the change in the internal energy of zinc when 1.50 kg of zinc sublimates? *102.
| The sublimation of zinc (mass per mole = 0.0654 kg/mol) takes place at a temperature of 6.00 × 10² K, and the latent heat of sub- limation is 1.99 × 10º J/kg. The pressure remains constant during the sublimation. Assume that the zine vapor can be treated as a monatomie ideal gas and that the volume of solid zinc is negligible compared to the corresponding vapor. Concepts: (i) What is sublimation, and what is the latent heat of sublimation? (ii) When a solid phase changes to a gas phase, does the volume of the material increase or decrease, and by how much? (iii) As the material changes from a solid to a gas, does it do work on the environment, or does the environment do work on it? How much work is involved? (iv) In this problem we begin with heat Q and realize that it is used for two purposes: First, it makes the solid change into a gas, which entails a change AU in the internal energy of the material, AU = Ugus - Usolid. Second, it allows the expanding material to do work W on the environment. According to the conservation-of-energy princi- ple, how is Q related to AU and W? (v) According to the first law of ther- modynamics, how is Q related to AU and W? Calculations: What is the change in the internal energy of zinc when 1.50 kg of zinc sublimates? *102.
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Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
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Transcribed Image Text:| The sublimation of zinc (mass per mole = 0.0654 kg/mol)
takes place at a temperature of 6.00 × 10² K, and the latent heat of sub-
limation is 1.99 × 10º J/kg. The pressure remains constant during the
sublimation. Assume that the zine vapor can be treated as a monatomie
ideal gas and that the volume of solid zinc is negligible compared to
the corresponding vapor. Concepts: (i) What is sublimation, and what is
the latent heat of sublimation? (ii) When a solid phase changes to a gas
phase, does the volume of the material increase or decrease, and by how
much? (iii) As the material changes from a solid to a gas, does it do work
on the environment, or does the environment do work on it? How much
work is involved? (iv) In this problem we begin with heat Q and realize
that it is used for two purposes: First, it makes the solid change into
a gas, which entails a change AU in the internal energy of the material,
AU = Ugus - Usolid. Second, it allows the expanding material to do work
W on the environment. According to the conservation-of-energy princi-
ple, how is Q related to AU and W? (v) According to the first law of ther-
modynamics, how is Q related to AU and W? Calculations: What is the
change in the internal energy of zinc when 1.50 kg of zinc sublimates?
*102.
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