Chem 162 Experiment 5 Determination of the Enthalpy of Vaporization of Water and

Question

Chem 162 Experiment 5 Determination of the Enthalpy of Vaporization of Water and the Exploration of Intermolecular Forces Pre-lab questions: 1. In terms of kinetic energy (KE), explain why vapor pressure increases with increasing temperature Provide a definition for the normal boiling point for a liquid. What should be the general trend in the data? and requires 32 kJ to vaporize 1 mole? volume of each of those liquids contains the same number of molecules as l microliter (L) of 2. 3· The data you will collect in this lab will be vapor pressures of water at various temperatures. 4 Calculate the normal boiling point of a compound that has a vapor pressure of 500 torr at 20°C 5. Complete the table in Part II of the experiment. The question wants you to determine what water. List the volumes here as part of your pre lab answers. 6. Rank the compounds i te Part table according to increasing vapor pressure at constant temperature. Justify your answers. Be sure to have all of your data tables prepared in your lab notebook

Explanation / Answer

1) As a substance is heated, the kinetic energy of the particles in the system increases. As kinetic energy is increased,the particles leave their fixed location and move around, and even escape to gaseous state. As the number of particles in gaseous state increases, vapour pressure increases.

2) boiling point of a sustance is defined as the temperature at which vapour pressure of the sustance becomes equals to atmospheric pressure.

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