Question

Calculate the radius of an atom of a hypothetical material, given that the material has an FCC crystal structure, a density of 10.310.3 gm/cm³, and an atomic weight of 170.5170.5 g/mol.

Answer #1

Calculate the radius of an silver atom in cm, given that Ag has
an FCC crystal structure, a density of 10.5 g/cm3, and
an atomic weight of 107.87 g/mol.

Calculate the radius of iridium atom, given that Ir has
an FFC crystal structure, a density of 22.4 g/cm3 and atomic weight
of 192.2g/mol.

compute the atomic weight of an atom whose theoretical density
is 133g/mol .the atomic radius of an atom is 0.1445 nano meters.the
unit cell of the atom has FCC crystal structure

Below are listed the atomic weight, density, and atomic radius
for three hypothetical alloys at room temperature. For each
determine whether its crystal structure is FCC, BCC, or simple
cubic and then justify your answer.
Alloy
Atomic weight
Density
Atomic radius
(g/mol)
(g/cm3)
(nm)
A
195.08
21.45
0.139
B
209
9.32
0.335
C
55.85
7.87
0.124

A certain material has a FCC crystal structure with an atomic
radius of 1.44 A° (1 A° = 10-8 cm), and an atomic mass of 197.
Calculate:
a) The lattice constant ‘a’ of unit cell in cm,
b) The atomic packing factor of the material.

1) For a metal that has the face-centered cubic (FCC) crystal
structure, calculate the atomic radius if the metal has a density
of (8.000x10^0) g/cm3 and an atomic weight of
(5.80x10^1) g/mol. Express your answer in
nm.
2) Consider a copper-aluminum solid solution containing
(7.82x10^1) at% Al. How many atoms per cubic centimeter
(atoms/cm^3) of copper are there in this solution?
Take the density of copper to be 8.94 g/cm3 and the
density of aluminum to be 2.71 g/cm3.

Calculate the theoretical density of an unidentified atom that
has an HCP crystal structure if the lattice constants are a = 300
pm and c = 450 pm. Atomic weight of the atom is 45.2 g/mol.
Avogadro's number = 6.023 x 1023 atoms/mole.

Niobium (Nb) has an atomic radius of 0.1430 nm and a density of
8.57 g/cm^3. Determine whether it has an FCC or a BCC crystal
structure.

BCC (body-centered cubic) crystal structure is one of common
crystal structuresfor metals. Please do the following
questions.
(a) Describe what is a BCC structure and draw a BCC unit
cell.
(b) Calculate the radius of a vanadium (V) atom, given that
V has a BCCcrystal structure, a density of 5.96 g/cm3,
and an atomic weight of 50.9 g/mol.

Consider a hypothetical metal that has a simple cubic structure,
a density of 9.62 g/cm3, and an atomic weight of 90.5
g/mol. If, at the melting temperature, one out of every
104 atom sites is a vacancy, determine the number of
vacancies in one cubic meter of this material. Assume that the
energy for the vacancy formation is 96,000 J/mol.
Answer should be in units of vacancies/m^3

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