Organic chemistry pre-lab help

User Generated

PynverZnevr2294

Science

Description

Read what I have posted below to do the pre lab. I need help doing the pre lab stuff for my upcoming lab. I can do #1, but I need help with #2 (gas chromatography) and #3 (stoichiometry table for the table please use the example provided, but draw out the appropriate structures.

Unformatted Attachment Preview

THE DIELS-ALDER REACTION OF A CONJUGATED DIENE IN EUCALYPTUS OIL This experiment produces the Diels-Alder product of a conjugated diene present in eucalyptus oil; your goal is to determine which of the two possible dienes was actually used as the starting material. Pre-Laboratory assignment: 1. You must obtain MSDS information for maleic anhydride. (Note: there are no PC's available for the reaction product.) 2. A gas chromatogram of eucalyptus oil is shown below. Assume that the unknown conjugated diene of interest corresponds to the largest peak on the chromatogram, and that the peak areas are proportional to the masses of each component. Using this chromatogram and the Percent Area data given in Table 1, estimate the mass of the diene in 1 gram of eucalyptus oil. There are several methods one could use to obtain the amount; all should give the same answer. Gas Chromatogram of Eucalyptus Oil TIC: DLW EUC.D un dance 683 4 oooooo 35 OOOOO 30OOOOO 0 0 250OOOO 0 0 0 0 o o o o o o o o 2000000 7.07 1 5 OOOOO 7 1 7 1 оооооо 7.13 5 OOOOO 6 9 8 TTTTTTT TTTTT Time -->? 3.706.756.806.856.906.9 57.007.057.107.157.207.257.30 Table 1. Peak Data from Eucalyptus Oil Retention Time 6.834 6.984 7.074 7.135 7.175 Area 6303786 393327 1854048 758238 1270933 Percent Area 59.580 3.718 17.524 7.166 12.012 Percent Ratio 100.000 6.240 29.412 12.028 20.161 59 Using the Stoichiometry Table below as a guide, include a completed table in your laboratory notebook in the Stoichiometric Information Section. You will need to calculate the amount of maleic anhydride necessary to react with the mass of the diene used (from #2 above; note the mole ratio from the reaction). See Stoichiometric Information Tables for further instructions. Note: Although you do not know which one of the two dienes is present in eucalyptus oil, both have the same molecular weight. Hence, the moles used in the table will be the same, and the theoretical yield in moles and grams will be the same for both dienes. Also note: because the amount of maleic anhydride is calculated from the amount of diene used, in this case neither reactant will be limiting; the number of moles of both reactants will be the same. a-terpinene Et20 Reaction: Et20 or You draw both products A maleic anhydride a-phellandrene From part Amount in grams You calculate You calculate #2 above Molecular Wt. (g/n) From PC Table From PC Table Calculate from the structure Other Moles You calculate You calculate Moles from limiting reagent Maximum Moles of Product You calculate You calculate Limiting Reagent In this case, both are the same neither will be limiting. 60 Stoichiometric table Stilbene Hydrogen peroxide Hydrogen bromide 1,2-Dibromo- Water 1,2- diphenilethane 0.45ml 0.75ml Amounts 0.2ml 0.6ml 0.4ml 18.015g/mol Molecular 180.25g/mol 34.0147 g/mol 80.91g/mol 340.05g/mol weight Moles 0.001109mol 0.01176mol 0.00742mol 0.00132mol 0.04163mol Theoretical 0.1998979 yield Molar 180.25g 34.0147g 80.91g 340.05g 18.015g mass Limiting reagent The limiting reagent is stilbene
Purchase answer to see full attachment
User generated content is uploaded by users for the purposes of learning and should be used following Studypool's honor code & terms of service.

Explanation & Answer

...


Anonymous
Really useful study material!

Studypool
4.7
Trustpilot
4.5
Sitejabber
4.4

Similar Content

Related Tags