Calculate the volume in centimeters cubed of a simple cubic unit cell. If it's composed of atoms with a radius of 2.5 angstroms. All right, so just remember that volume equals your edge length cubed, And this is true for any cube. And we're going to say here that our edge length for a simple cubic unit saw is edge length a is equal to two times my radius.
Because our volume needs to be in centimeters, we have to convert our angstroms also into centimeters. So we have 2.5 angstroms. Remember the conversion factor is that one angstrom is equal to 10-10 meters. Meters goes here and centimeters up here. 1 centi is 10-2, so this comes out to be 2.5×10-8 centimeters.
So that's my radius in centimeters. So now multiply it by two. So this equals 5.0×10-8 centimeters. And then all we have to do here is cube this number and we'll have our volume in centimeters cubed. So when I cube this, it's going to give me back as an answer 1.3×10-22 centimeters cubed. So this would be our final answer.