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Enthalpy of Vaporization pre Lab, Lab Reports of Chemistry

pre-Lab Report for enthalpy of vaporization

Typology: Lab Reports

2022/2023

Uploaded on 07/27/2023

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VAPOR PRESSURE AND THE ENTHALPY OF
VAPORIZATION
Cesar Flores
LAVC Chemistry 101
July 22, 2023
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VAPOR PRESSURE AND THE ENTHALPY OF

VAPORIZATION

Cesar Flores LAVC Chemistry 101 July 22, 2023

Introduction

In this lab a volatile liquid will go to vaporization process which will be constant under given temperatures. After vaporization process the molecules go through liquid phase through condensation process. The partial pressure of a volatile gas is its vapor pressure at that given temperature. The vapor increases as the temperature increases. The enthalpy of vaporization will be found using the formula between pressure and temperature. Both temperature and pressure readings will be plotted on a graph. The slope of the line will be the negative enthalpy of vaporization over the gas constant.

Materials

  • 400 mL beaker
  • Vernier LabQuest device
  • 125mL Erlenmeyer flask
  • 600 mL beaker
  • Syringe
  • 3 mL ethanol

Procedure

  1. Set a 400 mL beaker with 250mL of water on a hot plate with 5 heat setting.
  2. Go to a Vernier LabQuest experimental setup.
  3. Connect the temperature probe to CH1 on top of LabQuest device and gas pressure sensor to CH2.
  1. Calculate vapor pressure of ethanol using total pressure in the flask is the sum of the pressure of the air and the vapor pressure of the ethanol.
  2. Calculate the natural logarithm of the vapor pressure where Po^ is 100 kPa.
  3. Convert temperature readings to Kelvin.
  4. Calculate the inverse of the absolute temperatures.
  5. Prepare a graph with ln(P/ Po) on the y-axis and 1/T (K-^1 ) on the x-axis.
  6. Determine the line to best fit the date and calculate the slope of the line.
  7. Calculate the enthalpy of vaporization.

Data Tables

Table 1 Trial 1 Trial 2 Trail 3 Trail 4 Trial 5 Initial Temperature (K) Initial Pressure (kPa) Final Temperature (K) Final Pressure (kPa) ln(P/ Po) 1/T (K-^1 )

Table 2 Slope of the Line Enthalpy of Vaporization