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Answer on Inorganic Chemistry Question for Amy

Question #33434
Suppose you performed a distillation of a solution containing 1-pentanol (C5H12O), 2-pentanol (C5H12O), 3-pentanol (C5H12O), and methyl alcohol (CH4O). All three pentanols here have the same chemical formula, but they do have a different arrangement of their atoms (i.e. they are shaped differently), so this makes them have slightly different properties from one another. During the distillation, you collect the FIRST product that comes out, and set it aside. Then, you collect the SECOND product that comes out, and set it aside Then, you collect the THIRD product, analyze it, and determine that it has a formula mass of approximately 88 amu. What is the identity of this second product that you collected
Expert's answer
All of your pentanols have molecular mass that is 88. One thing that can help you to determine order of evaporation of pentanols is boiling temperature. Here is the list of pentanols and their boiling temperatures:
1-pentanol / 137-139 °C
2-pentanol / 119.3 °C,
3-pentanol / 115.3 °C
As can you see second product is 2-pentanol.

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Assignment Expert
05.05.2014 08:03

Thanks for comment! Yes, the conclusion above is mistaken, 3-pentanol will be the second collected product.

04.05.2014 22:32

Wouldn't the second product be 3-pentanol since the Methyl Alcohol would come out first? Methyl Alcohol has a boiling point of 63.9 °C.

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