Lesson 10: Quantities in Chemical Reactions

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Pull out those calculators as we delve back into math problems.

Textbook Reading:  Chapter 8, pp. 249 to 271.



After reading through this chapter, I realized using ratios is a good way to do these calculations, but when they get long and complicated there is always the chance of missing units or accidentally flipping one of the conversion factors.

55 g Na x 2 moles Na/ 33 g Na x 56.7 g Na/1 mole NaCl….. It goes on and on.

One way to add structure to these calculations is to use proportions. To help you get started, I put together a video explaining the method. Even if you don’t choose to use the ratios and proportions, you may find some of the information about determining molar mass and moles helpful.

You can also use this method for finding percentages and even for the heat of reaction calculations.

Bozeman Science explains some of the concepts from the chapter as well (he uses the strings of ratios like the textbook):

Remember, the answers to the odd-numbered problems at the end of the chapter are given in the back of the book. You might want to try a few to make sure you understand them.

If you choose, let me know if you have any questions.

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