What can be created by mixing only c23 and h28? I am not familiar with chemistry and I am looking for a layman explanation. Thank you

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There would be quite a number of isomers.

Isomers are compounds that have the same molecular formula but a different chemical structure and therefore, different physical and chemical properties.

I cannot even imagine how long it would take me to figure out exactly how many there would be.

One possibility though, on the simpler side of the possibilities

Would be a 23 carbon straight chain with double bonds at carbons 4, 9, 12, and 14 and triple bonds at carbons 2, 7, and 16. The rest of the available bonds should tally up 28 hydrogens.

I am a little rusty on naming something like this with IUPAC conventions but I will give it a whirl...

4, 9, 12, 14 - tetra - ene - 2, 7, 16 - trieico - tri - yne

Perhaps someone else can double check my work and name that one a bit better.

Charly,
Your question may be quite innocent, but I can't help to wonder why you would ask specifically about c23 and h28, and wonder if you meant c23 h28 08 instead..?