Greetings,
This post is on the relationship between straight-chain alkane size and boiling point. One finds a linear association between molecular weight and boiling temperature for butane up to octane. For each incremental increase in carbon chain length, molecular weight increases by 14 amu; the weight of one -CH2 unit. Because there are no changes in structural effects, as MW increases, boiling point only depends on molecular size for linear alkanes. The following image provides a summary.
As indicated in the chart, the affect of increasing molecular weight on boiling point decreases for MW's above that of octane. This relates to the fact that increases in MW for linear alkanes larger than octane contribute much less, relative to the total MW.
That's all for now. As always, thank you for reading!
A Publication of http://ExcellenceInLearning.biz
This post is on the relationship between straight-chain alkane size and boiling point. One finds a linear association between molecular weight and boiling temperature for butane up to octane. For each incremental increase in carbon chain length, molecular weight increases by 14 amu; the weight of one -CH2 unit. Because there are no changes in structural effects, as MW increases, boiling point only depends on molecular size for linear alkanes. The following image provides a summary.
As indicated in the chart, the affect of increasing molecular weight on boiling point decreases for MW's above that of octane. This relates to the fact that increases in MW for linear alkanes larger than octane contribute much less, relative to the total MW.
That's all for now. As always, thank you for reading!
A Publication of http://ExcellenceInLearning.biz
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