PHYSICAL CHEMISTRY-STUDENT SOLN.MAN.
PHYSICAL CHEMISTRY-STUDENT SOLN.MAN.
2nd Edition
ISBN: 9781285074788
Author: Ball
Publisher: CENGAGE L
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Chapter 21, Problem 21.17E
Interpretation Introduction

Interpretation:

The density of quartz is to be determined.

Concept introduction:

A unit cell of the crystal is the three-dimensional arrangement of the atoms present in the crystal. The unit cell is the smallest and simplest unit of the crystal which on repetition forms an entire crystal. Unit cell can be a cubic unit cell or hexagonal unit cell. The classification of a unit cell depends on the lattice site occupied by the atoms.

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Gallium has an orthorhombic structure, with a0 = 0.45258 nm, b0 = 0.45186 nm, and c0 = 0.76570 nm. The atomic radius is 0.1218 nm. The density is 5.904 g cm3, and the atomic weight is 69.72 g mol. Determine (a) the number of atoms in each unit cell; and (b) the packing factor in the unit cell.
The substance alpha chromium is found to crystallize in a cubic lattice, with an edge length of 871.7 pm. If the density of solid alpha chromium is 7.561 g/cm^3 , how many Cr atoms are there per unit cell?
Calculate the density of niobium if it occupies a body-centered cubic unit cell with an atomic radius of 142.83 pm. What kind of unit cell does europium occupy if its density is 5.243 g mL−1?

Chapter 21 Solutions

PHYSICAL CHEMISTRY-STUDENT SOLN.MAN.

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