Question

Place these hydrocarbons in order of decreasing boiling point:
paraffin :C36H74
methane: CH4
octane: C8H18
isooctane: C8H18( also known as 2,2,4 trimethylpentane)
octadecane: C18H36

Answer 1

@Photon336

Answer 2

Funny thing with these questions boiling point increases as the length of the hydrocarbon increases.

Also, if you've got branching that will decrease boiling point. Straight chain hydrocarbons will have a higher BP also because they can stack. And branched hydrocarbons can't stack as well. I'll draw these out for you a bit later. I have the phone app so I can't draw it while using this.

Answer 3

wait

Answer 4

Oh okay my problem was trying to determine these two isooctane: C8H18( also known as 2,2,4 trimethylpentane)
octadecane: C18H36

Answer 5

they have the same molar mass, but how can you tell which one will have the overall greater IMF?

Answer 6

When you say straight chain you mean like this ?

Answer 7

Here is the following question: The alkanes are a homologous series of compounds containing only carbon and hydrogen that have the general formula CnH2n+2. Members of this series include butane (C4H10), 3,3-dimethylpentane (C7H16), hexane (C6H14), and heptane (C7H16).

I need help distinguishing between compounds. I understand most of the strategies.

Answer 8

@Photon336

Answer 9

why?