It is possible to make crystalline solids that are only one layer of atoms thick. Such “two-dimensional” crystals can be created by depositing atoms on a very flat surface. (a) If the atoms in such a two-dimensional crystal can move only within the plane of the crystal, what will be its molar heat capacity near room temperature? Give your answer as a multiple of R and in J/mol · K. (b) At very low temperatures, will the molar heat capacity of a two-dimensional crystal be greater than, less than, or equal to the result you found in part (a)? Explain why.
It is possible to make crystalline solids that are only one layer of atoms thick. Such “two-dimensional” crystals can be created by depositing atoms on a very flat surface. (a) If the atoms in such a two-dimensional crystal can move only within the plane of the crystal, what will be its molar heat capacity near room temperature? Give your answer as a multiple of R and in J/mol · K. (b) At very low temperatures, will the molar heat capacity of a two-dimensional crystal be greater than, less than, or equal to the result you found in part (a)? Explain why.
It is possible to make crystalline solids that are only one layer of atoms thick. Such “two-dimensional” crystals can be created by depositing atoms on a very flat surface. (a) If the atoms in such a two-dimensional crystal can move only within the plane of the crystal, what will be its molar heat capacity near room temperature? Give your answer as a multiple of R and in J/mol · K. (b) At very low temperatures, will the molar heat capacity of a two-dimensional crystal be greater than, less than, or equal to the result you found in part (a)? Explain why.
The heat capacity of air at room temperature and pressure is approximately 21 J×mol-1×K-1. a) How much energy is required to raise the temperature of a room dimensions 5.5 m x 6.5 m x 3.0 m by 10°C from room temperature (298.15 K) assuming ideal behavior? b) How long will it take a heater rated at 1.5 kW to achieve that increase if 1 W = 1 J×s-1 (assuming no loss)?
A workshop with well-insulated walls and containing 800 m of air at 305 K is heated at constant pressure (atmospheric). Consider air to be an ideal diatomic gas.
(a) Determine the energy (in k) required to increase the temperature of the air in the building by 2.90°C.
kJ
(b) Determine the mass (in kg) this amount of energy could lift through a height 3.10 m.
kg
Consider substance 1 of density is melting at absolute temperature I and the pressure
P to form another substance. What is the change in internal energy in the process of
melting of 1 gram of substance 1? Let be the density of substance 1, P² be the density
of substance 2, and I be the latent heat of melting of 1 gram of substance 1.
(a) L+P
(b) L+P
(c) L-P
(d) L-P
I
-|R|R16 116
P₂ Pi
P Pr
1
P₂ Pi
P Pr
Chapter 18 Solutions
University Physics with Modern Physics, Volume 2 (Chs. 21-37); Mastering Physics with Pearson eText -- ValuePack Access Card (14th Edition)
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