What are the 18 octane isomers?

Help with my Chem lab!! Its super hard for me to understand!!!?

• 1. What is an isomer? How many possible isomers of heptane are there? What are the structural differences between these isomers? 2. Look at page 54 in your Laboratory Guide. Note that butane has two possible isomers but that decane has 75 possible isomers. Why does the number of possible isomers go up with an increasing number of carbon atoms? CHART: ~BOILING POINTS OF ALKANES~ METHANE Molecular Formula: CH4 Boiling Point: -61.0 # of Structural Isomers: 1 ETHANE Molecular Formula: C2H6 Boiling Point: -88.5 # of Structural Isomers: 1 PROPANE Molecular Formula: C3H8 Boiling Point: -42.0 # of Structural Isomers: 1 BUTANE Molecular Formula: C4H10 Boiling Point: 0.5 # of Structural Isomers: 2 PENTANE Molecular Formula: C5H12 Boiling Point: 36.0 # of Structural Isomers: 3 HEXANE Molecular Formula: C6H14 Boiling Point: 68.7 # of Structural Isomers: 5 HEPTANE Molecular Formula: 7H16 Boiling Point: 98.5 # of Structural Isomers: 9 OCTANE Molecular Formula: C8H18 Boiling Point: 125.6 # of Structural Isomers: 18 NONANE Molecular Formula: C9H20 Boiling Point: 150.7 # of Structural Isomers: 35 DECANE Molecular Formula: C10H22 Boiling Point: 174.1 # of Structural Isomers: 75

• Answer:

  1. "Each of two or more compounds with the same formula but a different arrangement of atoms in the molecule and different properties." nine isomers of heptane 2. There are more variables to work with