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24. Methane, Pentane, Hexane, Octane.

25.
a.
b.The branch chain would have the lower boiling point, and the straight chain would have the higher boiling point.

26.
a. A short, straight chain. This is because there are less molecules.
b. A short branched chain.  This is because there are less molecules.
c. A short branched chain. This is because straight chains have a higher boiling point.

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1. a. The data is organized by boiling points. b. Yes it is useful because we know there are less molecules.

2.

3.

4.

5.

6.

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6. C4H10 and C5H10

7.a. heptane and nonane b.C7H16 and C9H20

8. a. C25H50 b. molecular