bromination

# bromination - mol=1.18e-4 g of Br2-0.039 mol of Br2 x 0.45...

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Name: ___Derek Gray________ Drawer: ____1S_____________ Pre-lab questions for Experiment #10: Bromination of Alkenes 1. Calculate the theoretical yield for the bromination of trans-stilbene, assuming an excess of Br 2 and using the amount of trans-stilbene in the directions on Blackboard. 0.30 g of trans-stilbene x 1 mol ====== 0.00166mol of trans- stilbene 180.24928g 2.0mL Br2* 3.1028g/cm^3= 6.206 g of Br2 0.00166mol of trans-stilbene x 6.206g of Br2 == 0.010301296g of Br2 x 1mol == 6.45e-5 mol --- 1 mol 159.808g 6.206 g of Br2 x 1 mol == 0.03883mol of Br2 159.808 g 0.039 mol of Br2 x 0.30g of trans-stilbene = 0.01165g of trans-stilbene x 1 mol = 6.46e-5 mol 1mol 180.24928g 2. Calculate the theoretical yield for the bromination of trans-cinnamic acid, assuming an excess of Br 2 and using the amount of trans-cinnamic acid in the directions on Blackboard. 0.45 g of trans-cinnamic acid x 1mol ===== 0.00304mol of trans-cinnamic acid 148.16132g 6.206 g of Br2 x 1 mol == 0.03883mol of Br2 159.808 g 0.00304 mol of trans-cinnamic acid x 6.206g of Br2== 0.01886624g of Br2 / 159.808g x 1

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Unformatted text preview: mol=1.18e-4 g of Br2--0.039 mol of Br2 x 0.45 g of trans-cinnamic== 0.018g trans cinamic / 148.16132g x 1mol=1.18e-4g of trans cinnamic 3. What is meant by heating a mixture at reflux? When heating a reaction mixture under reflux the reaction mixture is contained in a flask fitted with a vertical condenser. As a result the vapours which would otherwise escape from the flask during heating turn back to liquids in the condenser and 'flow back' (that is 're-flux') into the mixture. So neither reactants nor products are lost during heating. 4. What precautions should be taken with Br 2 ? Why? Br2 is a strong irritant and, in concentrated form, will produce painful blisters on exposed skin and especially mucous membranes. Even low concentrations of bromine vapor can affect breathing, and inhalation of significant amounts of bromine can seriously damage the respiratory system....
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bromination - mol=1.18e-4 g of Br2-0.039 mol of Br2 x 0.45...

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