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Topic: Alkanes and Stability  (Read 3460 times)

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Offline zain

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Alkanes and Stability
« on: May 19, 2007, 06:19:13 PM »
I had an exam question that i came accross that i just couldn't find the answer to.
CH2 DHc per mole = -657kjmol-1 in straight compounds like C3H8, C5H12, C6H14
Whereas in cyclic compounds they're slightly higher (values were included)

so i was thinking perhaps its to do with ring strain?... but wouldn't that make them more stable for the larger ones?...
seeing as the highest value was for C3H6 which was -697?
if someone could help me that would be great
many thanks

Offline Donaldson Tan

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Re: Alkanes and Stability
« Reply #1 on: May 20, 2007, 12:14:51 PM »
Your question is very vague.

CH2 DHc per mole = -657kjmol-1 in straight compounds like C3H8, C5H12, C6H14

Define straight compounds

Whereas in cyclic compounds they're slightly higher (values were included)

Do you include aromatic compounds in your cyclic compounds?
"Say you're in a [chemical] plant and there's a snake on the floor. What are you going to do? Call a consultant? Get a meeting together to talk about which color is the snake? Employees should do one thing: walk over there and you step on the friggin� snake." - Jean-Pierre Garnier, CEO of Glaxosmithkline, June 2006

Offline english

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Re: Alkanes and Stability
« Reply #2 on: May 20, 2007, 12:27:10 PM »
I think by "straight" he means unbranched.

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