Scan_Doc0114 - 206 Chapter Five Gases •"'~ • • s...

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Unformatted text preview: 206 Chapter Five Gases • " '~ • • s . r i « ~ (a) (b) Figure 5.14 (a) One mole of N2(~ has a volume of approximately 35 mL and a density of 0.81 g/mL. (b) One mole of N 2 (g) has a volume of 22.42 L (STP) and a density of 1.2 x 10- 3 g/mL. Thus the ratio of the volumes of gaseous N2 and liquid N2 is 22.42/0.035 = 640, and the spacing of the molecules is 9 times farther apart in N2(g). A model is considered successful if it explains the observed behavior in question and predicts correctly the results of future experiments. It is important to understand that a model can never be proved absolutely true. In fact, any model is an approximation by its very nature and is bound to fail at some point. Models range from the simple to the ex- traordinarily complex. We use simple models to predict approximate behavior and more complicated models to account very precisely for observed quantitative behavior. In thi text we will stress simple models that provide an approximate picture of what might be...
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This note was uploaded on 12/13/2010 for the course CHEM 2301 taught by Professor Bill during the Spring '10 term at South Texas College.

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