# chemistry

this is a wiley plus problem and there is no reading lesson with this section so im not sure how to approach this question:

The element iridium has ccp packing with a face-centered cubic unit cell. The density of Ir is 22400 kg/m3. Calculate the volume (cm3) of the unit cell of iridium.

The molar mass of iridium is 192.22 g/mol

Thanks!

1. 0
2. 0
3. 25
asked by Tokey
1. mass = volume x density; therefore,
volume = mass/density. You know the density; therefore, we need to determine the mass of a unit cell.
An atom of Ir has a mass of 192.22/6.022 x 10^23. There are 4 atoms/unit cell which makes the mass of a unit cell then
4 x 192.22/6.022 x 10^23. Substitute into the first equation above and calculate volume. If you want the volume in cc, you must have the density in g/cc. 22,400 kg/m^3 = 22.4 g/cc.

1. 0
2. 0
posted by DrBob222

## Similar Questions

1. ### Social Studies (Grade 8)

What should be your first task when you begin a new lesson? A. Read the section in the online textbook B Start to fill out the Vocabulary knowledge rating chart C Take the lesson assessment D Copy the comprehension questions into

asked by Bobby The Buildey on July 31, 2017
2. ### Math

The lesson that I am working on is called mathematical induction. The only problem is that the lesson was not explained very clearly due to a problem with the recording so I have no idea how to complete this problem. Find p

asked by Abbey on April 7, 2010
3. ### Science study skills

What is the most effective way to begin studying a lesson? 1.) Make up questions about the lesson. 2.) Look at the headings and subheadings of the lesson to get an idea of what the lesson is about. 3.) Review the lesson that comes

asked by Snoopy on August 25, 2015
4. ### physics

Another scheme to catch the roadrunner has failed. A safe falls from rest the top of a 30.2 m high cliff toward Wiley Coyote, who is standing at the base. Wiley first notices the safe after it has fallen 17.4 m. How long does he

asked by luma on September 21, 2015
5. ### Grammar Advisor

Are these correct? I mark my answer with an X. 88. The reason to list all of the preliminary (non-procedural) information in a lesson plan is to be sure have considered each aspect. keep good records for your future needs. be able

asked by William on September 26, 2013
6. ### psychology

Brad wonders if he will have a problem later in life with alcoholism. His father is an alcoholic and his great-grandfatheer had a problem holding a job due to his drinkng habits. After reading this lesson, Brad believes that a/an

asked by bj on September 30, 2011
7. ### English

In The Importance of Being Earnest, Jack and Algernon clearly have a preoccupation with food. In this lesson, you explored the deeper meaning of this preoccupation. Using what you learned in this lesson and what you have read in

asked by Becky on May 16, 2016
8. ### Science

2. Your friend John complains about his poor grades. You go to his house to study one day. The only place John has to study is at the kitchen table. While you are there, his younger brothers run through the kitchen screaming over

asked by Lily p on September 21, 2016
9. ### Science

2. Your friend John complains about his poor grades. You go to his house to study one day. The only place John has to study is at the kitchen table. While you are there, his younger brothers run through the kitchen screaming over

asked by Tila strong on September 20, 2016
10. ### physics

Wiley Coyote (Carnivouous hungribilous) is chasing the roadrunner (Speediburd cant- catchmi) yet again. While running down the road, they come to a deep gorge, 22 m straight across and 101 m deep. The roadrun- ner launches itself

asked by squires on September 3, 2011

More Similar Questions