**Experimental Procedure**1. **Safety Precautions:** Wear gloves throughout this procedure.2. **Preparation:** - 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 the crystals in your lab notebook.3. **Dissolution:** - Clamp the flask on a magnetic stir/heat plate. - Heat and stir to dissolve the trans-stilbene gently; avoid heating too quickly.4. **Reaction:** - Add 4.0 g of pyridinium tribromide. - If solid material sticks to the flask walls, rinse with a small amount of ethanol. - Heat with stirring for 5 minutes after adding the reagents. - Remove the flask from the heat cautiously to avoid burns. - Observe the product starting to precipitate or crystallize.5. **Cooling:** - Allow the reaction mixture to cool to room temperature. - Chill in an ice bath.6. **Filtration:** - Collect the product by vacuum filtration using a pre-weighed fritted funnel or crucible; alternatively, use a ceramic Büchner funnel and filter paper. - If using a ceramic Büchner funnel, weigh the filter paper.7. **Washing:** - Rinse the crystals with ice-cold methanol to remove any pyridinium salts.8. **Observation:** - Record the color and shape of the crystals. - Allow crystals to dry until the next lab session.9. **Final Analysis:** - Weigh the product and determine the melting point. - Note: Pure stilbene dibromide will melt or decompose at 241 °C. # Educational Content: Physical Properties of Reactants## Instructions1. Complete the following table of physical properties. Show your mole calculations for trans-stilbene and pyridinium tribromide in the space below.## Data Table**Table I: Physical Properties of Reactants**| Compound | MW (g/mol) | Volume used (mL) | Grams used | Moles used | Density (d) (g/mL) | MP (°C) | BP (°C) ||--------------------------|------------|------------------|------------|------------|--------------------|---------|---------|| trans-stilbene | | | | | | | || ethanol | | | | | | | || pyridinium tribromide | 319.84 | | | | | 130 | || stilbene dibromide | | | | | | | |### Notes- **MW**: Molecular weight in grams per mole.- **MP**: Melting point in degrees Celsius.- **BP**: Boiling point in degrees Celsius.This table outlines the essential physical properties necessary for calculations and understanding the reactions involving these compounds.

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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