A mixture of 1-hexanol, hexane, and 1-chlorohexane is injected on a gas chromatography column. a) Predict the sequence of retention times indicating which compound will have the shortest, middle, and longest retention time. b) The sample vial of (a) was not carefully sealed and left partially open for a couple hours. A GC is taken again with only two peaks realized. The first peak to appear has an area of 24 mm2 and the second peak 40 mm2. What mole% of each compound (specify the compound name) is most likely present?

A mixture of 1-hexanol, hexane, and 1-chlorohexane is injected on a gas chromatography column. a) Predict the sequence of retention times indicating which compound will have the shortest, middle, and longest retention time. b) The sample vial of (a) was not carefully sealed and left partially open for a couple hours. A GC is taken again with only two peaks realized. The first peak to appear has an area of 24 mm2 and the second peak 40 mm2. What mole% of each compound (specify the compound name) is most likely present?

EBK A SMALL SCALE APPROACH TO ORGANIC L

4th Edition

ISBN:9781305446021

Author:Lampman

Publisher:Lampman

Chapter91: Gas Chromatography

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

A chemist was able to extract a biologically active compound and wants to purify the sample since he is sure that the sample still contains impurities. After running the extract in TLC, the chemist found out that the sample produced only one spot near the solvent front. Suggest how the chemist can achieve a better resolution for the chromatogram.
1. In thin layer chromatography (TLC), why do you need to use a pencil in marking the spots, origin, and solvent front and not a marker? 2. Why is it necessary to mark the solvent front immediately? 3. Why do you need to ensure that the loading spot is above the solvent level in paper chromatography? 4. Why do different compounds travel different distances on the piece of paper?
You spotted a mixture of three compounds, labeled A-C, on a silica plate. The resulting thin layer chromatography (TLC) plate with a mobile solvent mixture of 95 % hexanes and 5 % ethyl acetate is shown below. Which of the spots traveled the furthest up the TLC plate corresponding to spot 3?
All three of these are gas chromatography runs from my sample. I'm trying to figure out what it means when my retention times are as the following. Does this just mean that the machine can't get an accurate read because my sample is un pure?
1) When you try separating an unknown mixture by normal-phase liquid chromatography with 50% hexane and 50% methyl t-butyl ether, the peaks are too close together. (not resolved) Should you use a higher or lower concentration of hexane in the next run?
Explain why the indicators, red and blue, are separated on the TLC plate during a chromatography lab.
If a column was run on the sample shown in lane 3, what would be the first compound to elute off of the column? (assume the same solvent and stationary phase are used) Which of the lanes on this TLC plate show pure compounds? Select all that apply.
If you use pure methanol in the begining of normal phase chromatography then A none of the above B there will be good separation C all compounds will be eluted D compounds will not be eluted
A thin-layer chromatography (TLC) experiement was run using three compunds: benzophenone, benzhydrol, and biphenyl. The three solvents that were used with the three compounds were hexane, ethyl acetate, and dichloromethane. Which solvent would be the best for separating these compounds and why?
Use a suitable model to explain how separation and identification of a mixture of organic compounds can be achieved with a thin layer chromatographic (TLC) technique.
Compare and contrast a column chromatography, TLC, and GC according to stationary phase, moving phase, recovery of sample, size or amount of sample. You could make it into a table.
A TLC plate showed two spots A and B with Rf 0.20 and 0.30, respectively. Sketch a TLC chromatogram with the above Rf values. (Hint: Start with a 10-cm TLC plate and allow 1 cm each for the start and end solvent fronts.) Determine the distances travelled from the start of the solvent front. ___?____ A ____?___ B Determine the distances left to the end of the solvent front. ___?____ A ____?___ B