Personalised Chemistry Notes - In this chapter we will...

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In this chapter we will consider the quantities of materials consumed and produced in chemical reactions. This area of study is called chemical stoichiometry (pronounced stoy?ke¯ ?om9?uh?tre¯ ). To understand chemical stoichiometry, you must first understand the concept of relative atomic masses. Can we count these nonidentical beans by weighing? Yes. The key piece of information we need is the average mass of the jelly beans. Let’s compute the average mass for our 10-bean sample.
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Unformatted text preview: Average Objects do not need to have identical masses to be counted by weighing. We simply need to know the average mass of the objects. We count atoms in exactly the same way. Because atoms are so small, we deal with samples of matter that contain huge numbers of atoms. Thus we determine the number of atoms in a given sample by Fnding its mass. However, just as with jelly beans, to relate the mass to a number of atoms, we must know the average mass of the atoms....
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