Last modified: Wed 03/09/2016 10:49:40 am

Oklahoma State University

It is OK to use your textbook or lecture notes from class, but if you can answers the questions without it that is OK too.

Do not press the RETURN or ENTER key while you are answering these questions. Your browser will interpret either the same as clicking on the Submit key.

Answer all of the questions below. If you do not know an answer enter CNA. However, it will help me the most if you answer each question with your best intuition/idea about what would be a reasonable answer.

First Name:

Last Name:

Laboratory Section:

Click on the Models360 link to open the page in a new tab. In the right side of the screen click on the Solids tab. In the new screen click on the Primary Ionic Structures button on the left side of the screen to reveal a list of structures. Click on the CsCl structure to see ionicCsCl structure and to rotate the structure.

1. Measure the edge length of the CsCl unit cell and enter below. (NOTE: When entering numbers with exponents enter 4.24 x10-8 as 4.24e-8.)

Edge length is


2. Calculate the volume of the CsCl unit cell.


3. The purple spheres are chloride ions and green sphere is the cesium ion. How many chloride and cesium ions in the CsCl unit cell?

chloride ion cesium ion

4. Determine the mass of 1 mol of CsCl in grams?


5. How many CsCl formula units are in one mole of CsCl?

formula units

6. Using the information in Q4 and Q5 calculate the mass of one formula unit of CsCl (in grams)?


7. Using you answers from Q2 and Q6 calculate the density of CsCl.

grams cm-3

8. Here is an image of that includes the unit cell of a compound that contains gallium and arsenic.

Ion Color
Ion Location
Number of this ion




Using Ga for the brown Cation and As for purple anion write the formula for this ionic compound.

9. Is there anything about the questions that you feel you do not understand? List your concerns/questions.

10. If there is one question you would like to have answered in lecture, what would that question be?