Scan_Doc0015 - molecules react with each other to form...

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108 Chapter Three Stoichiometry Bread Meat Cheese Sandwich To solve this problem, let's see how many sandwiches we can make with each component: 1 sandwich 8 slices bread X = 4 sandwiches 2 slices bread Bread: Meat: 1 sandwich 9 slices meat X = 3 sandwiches 3 slices meat Cheese: 1 sandwich 5 slices cheese X = 5 sandwiches I slice cheese How many sandwiches can you make? The answer is 3. When you run out of meat, you must stop making sandwiches. The meat is the limiting ingredient. See Fig. 3.9. What do you have left over? Making 3 sandwiches requires 6 pieces of bread. You started with 8 slices, so you have 2 slices of bread left. You also used 3 pieces of cheese for the 3 sandwiches, so you have 2 pieces of cheese left. In this example, the ingredient present in the largest number (the meat) was actually the component that limited the number of sandwiches you could make. This situation arose because each sandwich required 3 slices of meat-more than the quantity required of any other ingredient. When
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Unformatted text preview: molecules react with each other to form products, considerations very similar to those involved in making sandwiches arise. We can illustrate these ideas with the re-action of Nz(g) and Hz(g) to form NH3(g): Nz(g) + 3H z (g) ~ 2NH 3 (g) Figure 3.9 Making sandwiches. /o-~~.--------O-.'.~.~'~~ ...~----~----~-~-'\- . . I ".' _, I , . . / I ' ./ :0'. 0.. . .. ..... .... -. --\ "'"- ~ /' \ . / \ " .. ' . I , I "0'--. .-.~-" 0 e. . . / ", -.--/--'," ,' / "v"/ .. _----_/ ','-~---::.-,-~---.-.-----"""",;-",-./ " . ,'. '>-. . . / ',. ........ / I , , I 1 \ \ \ 'V' 0""-> "-', +-.--./ ,. ./ '-----'"--'" .~ > /// '. //-O=;~~--', '.",'-. ./ e.: ',:; \ /0------/ "\.". ..,' '\ / '" 0. . .. ' I.,,>. , I ',_. _ ~ , I" _ ~ <, . .... I . <> ~>-...... _---------------------------,-, \ ., ~-,--,-/ / / / 10. ....
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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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