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David Cameron

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- TL;DR Summary
- The more difficult type of problem, the "Booger problem," is best at exercising logical thinking by the student in solving the problem.

I have taught introductory general chemistry to engineering majors for over 30 years. Upon one occasion, a student told me "I sort of like the homework ... except the booger problems that I can't do." But it is exactly those problems, the more difficult type of problems, that give the student the best problem solving exercise to prepare for quizzes and tests. I have developed a special tool for working out booger problems in reaction stoichiometry. I call this tool the "arrow diagram method." The method is described at www.jimetherdrift2013.net/arrowdiagram.html. The method is very helpful in solving "booger problems" like the following:

NH3 (g) + 5 O2(g) = 4 NO (g) + H2O (l)

When 42 grams of ammonia are reacted with 60 grams of oxygen in a closed container, the final mixture of gases in the container is 42.0 % NO(g) by mass. What is the percent yield of the reaction? ( = 69.1 %)

The arrow diagram solution to this problem, and a couple of similar problems, are posted at www.jimetherdrift2013.net/arrowdiagram.html.

NH3 (g) + 5 O2(g) = 4 NO (g) + H2O (l)

When 42 grams of ammonia are reacted with 60 grams of oxygen in a closed container, the final mixture of gases in the container is 42.0 % NO(g) by mass. What is the percent yield of the reaction? ( = 69.1 %)

The arrow diagram solution to this problem, and a couple of similar problems, are posted at www.jimetherdrift2013.net/arrowdiagram.html.