# Vapor Pressure Essay

378 Words2 Pages
Vapor Pressure and Enthalpy of Vaporization of Water I. List of Reagents: a. Water H2O II. Summary of Procedure: b. Fill a 10 mL graduated cylinder with ≈ 7mL if water c. Fill a 1000 mL beaker with ≈ 750 mL of water d. Invert the graduated cylinder into the beaker. Add water to the beaker to completely submerge cylinder. e. Measure the difference between the height of the water in the graduated cylinder and the height of the water in the beaker. f. g. Record the barometric pressure in mmHg. Heat the water via Bunsen burner to 80°C. Record the temperature and volume. As the temperature begins to decline back to 50°C, record the temperature and volume every 5°C. h. Once the temperature reaches 50°C, col the beaker rapidly to 0°C by adding ice. Finish by recording volume and temperature. III. Observations and Data Atmospheric Pressure | 769 mmHg | Height of water above glass | 50 mmH2O | Number of moles of air in the graduated cylinder: 5.957 x 10-4 Temperature | Volume | Adjusted Volume | Air’s Partial Pressure | Water Vapor Pressure | 80°C | 125 mL | 124.8 mL | 105.2 mmHg | 720.3 mmHg | 75°C | 115 mL | 114.8 mL | 112.72 mmHg | 712.3 mmHg | 70°C | 100 mL | 99.8 mL | 127.8 mmHg | 697.7 mmHg | 65°C | 97 mL | 96.8 mL | 129.9 mmHg | 695.6 mmHg | 60°C | 87.5 mL | 87.3 mL | 141.9 mmHg | 683.6 mmHg | 55°C | 79 mL | 78.8mL | 163.1 mmHg | 662.4 mmHg | 50°C | 75 mL | 74.8 mL | 160.6 mmHg | 664.9 mmHg | 0°C | 12.5 mL | 12.3 mL | 825.5 mmHg | 0 mmHg | Pressure of Cylinder | Pressure of Atmosphere | Pressure Exerted by water | 825.5 mmHg | 769 mmHg | 56.54 mmHg | * Percent error: * Hexane is completely non-polar and will readily interact with other molecules, while water is polar and will not interact as easily. Therefore, hexane is more likely to break its bond to