Activity III.A |

Build the proposed structure for buckminsterfullerene (C) using your Cochrane's Molecular Models. Consider the following questions while inspecting your model.

- How many five- and six-membered rings are there in the truncated icosahedron?
**Answer: twelve 5's and twenty 6's.** - Are the five-membered rings isolated or contiguous?

**Answer: isolated.**

How about the six-membered rings?

**Answer: contiguous.** - How many different kinds of vertices are there?

**Answer: one.** - How many different kinds of edges are there?

**Answer: two, those that lie between two six-membered rings and those that lie between one six- and one five-membered ring.** - How many of each kind of edge are there?

**Answer: 30 of the 6-6 variety and 60 of the 6-5 type.** - Given that the average edge is approximately 1.4
Å long, estimate the size of the cavity
(diameter and volume).

**Answer: Diameter is ~ 7 Å and volume is ~ 180 Å.**