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The balanced form of the chemical reaction reveals what is called the stoichiometry of the reaction. The stoichiometry tells you about the relationship between how many molecules of products will be produced for each molecule of reactant. Why is that useful? Let's use the following made up reaction: A + 2B --> C That means that two molecules of B are necessary to combine with one molecule of A to make one molecule of C. So if I want to make 100 molecules of C, I'll need to start with 100 molecules of A and 200 molecules of C. I could also think about it the other way: If I have 50 molecules of A and 100 molecules of B, how much C can I make? Now I can make 50 molecules of C, right? There are a number of other ways to use stoichiometry as well. Another aspect is that mass is always preserved. What that means is that atoms can't just disappear! If an atom goes into a reaction as a reactant, it will come back out as a product. Every time. The balanced reaction is written so that everything that goes in comes out.

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