Unit Cell Video Lessons

Video Thumbnail

Concept

Problem: A particular form of cinnabar (HgS) adopts the zinc blende structure shown. The length of the unit cell side is 5.852 Å. Calculate the density of HgS in this form.

FREE Expert Solution

Recall: A zinc blende structure is a face-centered cubic unit cell. In a zinc blende structure:

The anions are located in the faces and corners of the unit cell

The cations are located in half of the tetrahedral holes present

In a single unit cell with a zinc blende structure, there are 4 cations and 4 anions present.

Recall that density is defined as:

We need to find the mass and volume of a single unit cell of HgS.

View Complete Written Solution
Problem Details

A particular form of cinnabar (HgS) adopts the zinc blende structure shown. The length of the unit cell side is 5.852 Å. Zn and S touch on a diagonal. The structure has a face-centered cubic lattice; a cube with lattice points at the corners and in the center of each face. The structure shows a cube with S as the corners (lattice points are in the center of each corner S). Layers of S alternate with layers of Zn.


Calculate the density of HgS in this form.

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Unit Cell concept. You can view video lessons to learn Unit Cell. Or if you need more Unit Cell practice, you can also practice Unit Cell practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Aviles' class at UNR.