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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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This note was uploaded on 12/07/2011 for the course CHEM 301 taught by Professor Sahli during the Spring '07 term at VCU.
- Spring '07
- Organic chemistry