Question

based on your results what is the correlation between retention time and molar mass?

• The lower the Urganic solvents. Put the 5 chemicals Doing Note that you do NOT need to pick compounds that adhere to a particular trend. These are the Pick 5 compounds from the through the simulator resha the nete open-ended to allow you to play with the program. Acetonitrile Chloroform Dichloromethane Diethyl ether Ethanol Isopropanol Heptane Hexane Methanol Pentane Toluene a) List your results here from the automated separation from the simulator: Column information: REX 502-2,30m, 0.25m ID, 1-4 um cac #1095) Carrier gas and flow rate: Helim, coxdant flow e2.com/min Oven Temperature Parameters: 35°c (hold 1 min) to 160°C @ 30°C/min Molar Mass Compound Peak number Retention Time almal mole Methanol 2 Ethanol 3 pentane 4 Chloroform Heptane Fill in the units 2.09 2.21 13.51 3.85 Boiling point from Sigma Aldrich - 55.8°C 67.7°C 71.3°C 110.3°C 120.3°C

Answer 1

Molar mass:

Methanol: 32.04g/mol

Ethanol: 46.07g/mol

Pentane: 72.15g/mol

Chloroform: 119.38g/mol

Heptane: 100.21 g/mol

As we know, the unique time it takes for a compound to exit the column after it is injected is called retention time.

Yes, the retention time and the molecular weight are reated. From our experiment we have observed that as the molecular weight increases, the retention time also increases. i.e Heavier the molecule, the slower it travel through GC coloum and higher will be the retention time.