Number of C for Hydrocarbons to be gas

[kenhung123]

What is the maximum number of C in a hydrocarbon that would still allow the hydrocarbon to be gaseous at room temo?

[Martoman]

Up to octane its a gas, up to its a liquid.

http://www.elmhurst.edu/~chm/vchembook/501hcboilingpts.html

[stonecold]

I was under the impression that it was C5 and above are liquids, until probably around C30 or something like that.

[Nomvalt]

does this differ between alkanes, alkenes and alkynes? i.e. the number of carbon atoms for a hydrocarbon to be liquid, solid or gaseous

edit: actually i remember from yr 11 chem, yes.

[kenhung123]

I think the purple part is a gas so only up to pentane

[crayolé]

Stonecold is correct in saying that in alkanes, C4 is a gas and C5 is a liquid.

Alkenes and Alkynes have a double bond and are bent so would have less dispersion forces between the molecules, hence most are gases and wont turn into liquids until higher

[Martoman]

Oh.my.bad

Yeah its colour coded not... up to where it says it. I knew something was up