1. Using reactant amounts of 0.5 mL 1M bromine solution and 0.5 mL ethylbenzene

Question

1. Using reactant amounts of 0.5 mL 1M bromine solution and 0.5 mL ethylbenzene show that bromine is the limiting reagent. You will have to calculate the molecular weight of ethylbenzene and look up its density to nd the number of moles to compare to the moles of bromine.

2. Sodium thiosulfate (Na2S2O3) can be used to reduce Br2 to harmless Br and is in turn oxidized to tetrathionate S4O2 6 . You will use it to clean up any bromine spilled or left in your apparatus. Write a balanced equation for this reaction

3. Draw the the most stable chair conformation of (1S,2R)-1-tert-butyl-2-methylcyclohexane.

4. The compound shown is tetrahydrogestrinone, an illicit doping steroid. Redraw tetrahydrogestrinone and circle all the chiral carbons and show by calculation how many stereoisomers there are.

Explanation / Answer

2)

2 Na2S2O3 + Br2 = Na2S4O6 + 2 NaBr

2(S2O3- + Br2 --> (S4O6)-2- + 2Br-   net Ionic equation

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