Experimental procedure.Be sure to wear gloves throughout this reaction. Place a magnetic stir bar, 2.0 g of trans-stilbene, and 40 mL of ethanol in a 125-mL Erlenmeyer flask. Note the shape and color of thecrystals in your lab notebook. Clamp the flask in place on a magnetic stir/heat plate. Withheating and stirring, dissolve the trans-stilbene. Be careful not to heat too quickly. Add 4.0 g ofpyridinium tribromide. If solid material adheres to the interior walls of the flask, use a littleethanol to rinse it down. Heat with stirring for 5 minutes after the addition of reagents iscomplete. Remove the flask from the hot plate. Use caution to avoid getting burned by the hotflask. The product should quickly begin to precipitate or crystallize.Let the reaction mixture cool to room temperature. Chill the mixture in an ice bath. Collect theproduct by vacuum filtration in a pre-weighed fritted funnel or fritted crucible. Alternatively, usea ceramic Büchner funnel and filter paper. If you choose a ceramic Büchner funnel, weigh yourfilter paper. Rinse the crystals during vacuum filtration with a small amount of ice-cold methanolto remove any adsorbed pyridinium salts. Be sure to note the color and shape of the crystalsafter you collect them. Allow the crystals to dry until the next lab period. Weigh product anddetermine the melting point. Pure stilbene dibromide will melt or decompose at 241 °C. 1. Complete the following table of physical properties. Show your mole calculations for trans-stilbene and pyridinium tribromide in the space below.Table 1: Physical Properties of Reactants.volumeMWCompound(g/mol)trans-stilbeneethanolpyridinium tribromide 319.84stilbene dibromidegrams molesused (mL) used useddMP(g/mL) (°C)130BP(°C)

Mass of trans-stilbene(MW = 180.25 g/mol) taken = 2.0 g Volume of ethanol taken = 40 mL Mass of…

1. Complete the following table of physical properties. Show your mole calculations for trans- stilbene and pyridinium tribromide in the space below. Table 1: Physical Properties of Reactants. MW Compound trans-stilbene volume grams moles (g/mol) used (mL) used used ethanol pyridinium tribromide 319.84 stilbene dibromide d MP (g/mL) (°C) 130 BP (°C)

1. Complete the following table of physical properties. Show your mole calculations for trans- stilbene and pyridinium tribromide in the space below. Table 1: Physical Properties of Reactants. MW Compound trans-stilbene volume grams moles (g/mol) used (mL) used used ethanol pyridinium tribromide 319.84 stilbene dibromide d MP (g/mL) (°C) 130 BP (°C)

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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