
To find:
a) The density of
b) If the atoms touch each other in the body diagonal of the unit cell.
c) The reason why we cannot determine the atom present in the cubic hole.
d) The arrangement of the conduction band and valence bands.

Answer to Problem 18.126QA
Solution:
a) The density of
b) Yes, the atoms of
c) The formula of the alloy does not allow us to differentiate the arrangement of
d)
Explanation of Solution
1) Concept:
The
In the unit cell of
2) Formulae:
i)
ii)
3) Given:
i) Edge length of the unit cell
ii) Molar mass of
iii) Molar mass of
iv) Avogadro’s number
4) Calculations:
a) Calculate the density of MgSr
Volume of unit cell
Molar mass of the
Density of the
Hence, the density of the
b) The atomic radius of magnesium is
c) In the cubic unit cell, the cations and anions are present in the cubic voids in the alternate unit cells. That is in one-unit cell,
d) Since both
Conclusion:
The density of the alloy is calculated from the edge length and the mass of the unit cell. The body diagonal is calculated from the atomic radii.
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Chapter 18 Solutions
Chemistry: An Atoms-Focused Approach
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