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djennings8055
27.02.2020 •
Engineering
BCC lithium has a lattice parameter of 3.5089 3 10–8 cm and contains one vacancy per 200 unit cells. Calculate (a) the number of vacancies per cubic centimeter; and (b) the density of Li.
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Ответ:
(a) The number of vacancies per cubic centimeter is 1.157 X 10²⁰
(b) ρ = n X (AM) / v X Nₐ
Explanation:
Given-
Lattice parameter of Li = 3.5089 X 10⁻⁸ cm
1 vacancy per 200 unit cells
Vacancy per cell = 1/200
(a)
Number of vacancies per cubic cm = ?
Vacancies/cm³ = vacancy per cell / (lattice parameter)³
Vacancies/cm³ = 1 / 200 X (3.5089 X 10⁻⁸cm)³
Vacancies/cm³ = 1.157 X 10²⁰
Therefore, the number of vacancies per cubic centimeter is 1.157 X 10²⁰
(b)
Density is represented by ρ
ρ = n X (AM) / v X Nₐ
where,
Nₐ = Avogadro number
AM = atomic mass
n = number of atoms
v = volume of unit cell
Ответ:
I believe the answer is man vs. society.
Margot is having trouble fitting in, she is what you'd call the man, and the people who ridicule her is what you'd call society.
It's not man vs. man because the others are not specified, it's not man vs. nature because there is no implication that there are natural forces in the works, and it's not man vs. himself because Margot isn't causing problems with herself, it's the others.
If this is incorrect, please, don't refrain to tell me. Thank you.