Based on the data table with the given information and the graphs showing the re

Question

Based on the data table with the given information and the graphs showing the results from a gas chromatography lab (the pressure was changed for each run in this experiment by 5 so, it started off 5,10, and 15) predict the order of elution of the tested compounds. Justify your response.

Compound Boiling Point (C) Molar Mass (g/mol) Bonding Functional Group Methanol Propyl acetate Butyl acetate 2- butanone 4-methyl-2-pentanone 64.7 102 126 79.59 115.8 32.04 102.131 116.15828 72.10572 CH-COcH,CH, 100.15888 -CH-COCH,CHICH) -OH -CH3-COO-CH CH2CH -CH3-COCH2CH3 100.15888 CH CoCH,CH(CH,)2

Explanation / Answer

The retention time of solute decreases as the vapor pressure of the solute increases.

Increasing the pressure increases the flow of mobile phase rate and decreases retention time.

Order of elution of the compounds:

Run3: 3 kPa

ETOH, Acetone, Methanol, and Ethyl acetate.

Run3: 5 KPa

Acetone, Methanol, and Ethyl acetate.

Run3: 7 kPa

Methanol, Acetone, EtOH, Ethyl acetate

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