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General Chemistry Principles, Patterns, and Applications, 2011

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21.<br />

a. CO + 2H 2 → CH 3 OH<br />

b. 58.28%<br />

22.<br />

23.<br />

a. 2.24 g Cl 2<br />

b. 4.95 g<br />

c. 2.13 g CH 3 CH 2 CH 2 Cl plus 2.82 g CH 3 CHClCH 3<br />

24.<br />

25.<br />

a. chlorobenzene<br />

b. ammonia<br />

c. 8.74 g ammonium chloride.<br />

d. 55%<br />

e.<br />

Theoretical yield (NH 4 Cl)<br />

=mass of chlorobenzene (g) × 0 .92 × 53 .49 g/mol 112 .55 g/mol<br />

[1] In the laboratory, a student will occasionally obtain a yield that appears to be greater than<br />

100%. This usually happens when the product is impure or is wet with a solvent such as water.<br />

If this is not the case, then the student must have made an error in weighing either the<br />

reactants or the products. The law of conservation of mass applies even to undergraduate<br />

chemistry laboratory experiments!<br />

3.5 Classifying Chemical Reactions<br />

L E A R N I N G O B JE C T I V E S<br />

1. To identify fundamental types of chemical reactions.<br />

2. To predict the types of reactions substances will undergo.<br />

The chemical reactions we have described are only a tiny sampling of the infinite number of chemical reactions<br />

possible. How do chemists cope with this overwhelming diversity? How do they predict which compounds will react<br />

with one another <strong>and</strong> what products will be formed? The key to success is to find useful ways to categorize reactions.<br />

Saylor URL: http://www.saylor.org/books<br />

Saylor.org<br />

255

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