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Lecture 3

CHM135H1 Lecture Notes - Lecture 3: Chemical Formula, Gallium, Boron

Course Code
Dvira Segal

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You should be able to do any of the following questions from the course textbook, McMurry
and Fay (6th Edition). You may not need to do all of the questions! Do as many or as few as
you feel is necessary to achieve an understanding of the course material to date. You are the
best judge of your own learning!
Please note that the questions given below have full solutions in the Student Solutions
Manual. The solutions manual is best used to check your final answers rather than to provide
you with step-by-step instructions to answer each question. Keep in mind that the questions
and their solutions are to help you understand and apply the concepts involved in each
question rather than to demonstrate the detailed mechanics of answering the question. In
other words, you must be able to work through the problems and achieve the final answer by
yourself (active learning) rather than using the solutions manual to tell you how the problem
could be solved (passive learning). Learning how to solve problems in science comes
through active learning!
Suggested problems for practice:
Chapter 9 (even-numbered questions only): 9.2, 9.6 9.20, 9.28 9.42, 9.46 9.76, 9.84,
9.88 9.96, 9.100, 9.102, 9.110, 9.112, 9.120, 9.122, 9.130, 9.132(!).
Of the above, the following represent some of the better questions:
Chapter 9: 9.72, 9.112, 9.120, 9.122, 9.130, 9.132(!).
In addition, the following problem will be discussed in your CHM139 tutorial:
1. A 2.842g sample of a gaseous compound of boron and chlorine occupies 0.153L. This
sample is decomposed to give 0.664g of solid boron and enough Cl2 gas to occupy 0.668L at
the same temperature and pressure. Determine the empirical formula and molecular formula
of the compound.
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