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17.
a.C9H2O
b.C10H22
c.C16H34
d.C18H38

18.
a. 128 grams
b. 142 grams
c.226 grams
d.254 grams

19.
a.C3H8
b.C5H12

20. yes

21. On seperate piece of paper

22. Ethane

23. They both have the same amount of atoms so they're both correct.