1.65 mm
<h3>
Further explanation</h3>
<u>Given:</u>
A crystallographer measures the horizontal spacing between molecules in a crystal. The spacing is 16.5 nm.
<u>Question:</u>
What is the total width of a crystal in millimeters that is 10⁵ molecules across?
<u>The Process:</u>
We will solve the problem of unit conversion, especially the unit of length. This time we will convert nanometers to millimeters.
Recall that,


Crystallographers observe 10⁵ molecules across with the intermolecular distance in the crystal is 16.5 nm.

We cross out the same units.





Thus, the total width of a crystal in millimeters is 1.65 mm.
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Keywords: crystallographer, measures, the horizontal spacing, between, molecules, in a crystal, 16.5 nm, the total width, a crystal, in millimeters, nanometers, 10^5 molecules across, write, your answer, as a decimal, conversion, the unit of length, 1.65