Concept explainers
(a)
Interpretation:
The spacing between the layers that is present in the potassium iodide crystal that gives rise to
(a)
Answer to Problem 11.88QE
The spacing between the layers in crystal of
Explanation of Solution
Wavelength of X-ray is given as
Bragg equation can be used to determine the spacing between the layers. Bragg equation is given as shown below;
Where,
Substituting the values in equation (1), the spacing between the layers can be calculated as shown below;
Therefore, the spacing between layers is
(b)
Interpretation:
Density of
(b)
Answer to Problem 11.88QE
Density of potassium iodide is
Explanation of Solution
The crystal is of
The unit cell of potassium iodide is face centered cubic cell. Therefore, there are eight corners and thus one atom is shared by eight other unit cells that are present. One atom is present at the center of each face of the cell. Therefore, the total
The volume of the cubic cell can be calculated using the edge length. This can be done as shown below;
Volume of cubic cell can be converted into centimeters as shown below using conversion factors;
Molar mass of
Therefore, mass of
Density of the potassium iodide crystal can be calculated using the density formula as follows;
Thus, density of potassium iodide is calculated as
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