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SABIC CHEM 101 Chapter 3 - Part 1

# SABIC CHEM 101 Chapter 3 - Part 1 - Chemistry101 Chapter3...

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9/28/10 1 Chemistry 101 Chapter 3 Stoichiometry Stoichiometry Stoichiometry is the study of quantities of materials consumed and produced in chemical reactions. Stoichiometry allows us to talk about how much of a given compound/element will react with another compound/element to give a new substance. Stoichiometry also allows us to talk about the relative proportions of elements in a given substance. H 2 + O 2 2H 2 O In order to effectively talk about stoichiometry we must first discuss the amounts of atoms/molecules that we are dealing with

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9/28/10 2 NO!! The particles are too small! We use the MASS to determine the amount of substance. Atomic Masses Because atoms are so small, we deal with samples of matter that contain huge numbers of atoms. Even if we could see the individual atoms in a given sample, it would not be possible to count them directly. To determine the number of atoms in a given sample we relate the mass of the sample to the average mass of the atoms. How do we determine the average mass of an atom?
9/28/10 3 A Proof‐of Concept Suppose we are selling jelly beans. Rather than count out the number of jelly beans individually for each order, we create a relationship that relates the number of jelly beans in a given unit of mass. Bean 1 = 5.1 g Bean 2 = 5.2 g Bean 3 = 5.0 g Bean 4 = 4.9 g Bean 5 = 4.8 g Individual weights of beans Average weight of beans (5.1+5.2+5.0+4.9+4.8)/5 = 5.0 g This average weight allows us to relate total mass of jelly beans to total number of jelly beans and we do not have to count the number of jelly beans in a given sample.

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