Presented are the teacher's guide and student manual for one of a series of self-instructional, computer-based learning modules for an introductory, undergraduate chemistry course. The student manual for this unit on the concept of the mole includes objectives, prerequisites, discussion, problem exercises, and 20 problem sets. Included in the teacher's guide are implementation instructions, references, answers to problem sets, sample run of the program showing a quiz being printed and students' answers being graded, a listing of the computer program in BASIC, and 10 unit tests. (BT)