Question

figure 1

Liquid ethanol mm P increasing P = equilibrium vapor pressure P=0 Add System comes to equilibrium ethanol Evacuated flask, pressure zero Molecules begin to vaporize, pressure increases Molecules leave and enter liquid at equal rates, pressure reaches steady-state value

Figure 2

Answer 1

From the graph we could see that

34.6 °C 78.3 °C 100°C Normal boiling point Diethyl ether Vapor pressure (torr) Ethyl alcohol Temantony Water Ehylene 18ycol 100 20 40 60 80 Temperature (°C) Copyright 2009 Pearson Prentice Hall,Inc.

The vapor pressure of water at 80 degrees is approximately 360 torr

b) Average kinetic energy of molecules increases so more are able to overcome the intermolecular forces in liquid state.

c) At 20 degrees Celsius we could see from the graph that di-ethyl ether exerts more vapor pressure, hence it evaporates quickly.

d) we could see from the graph that at 450 torr , temperature is approximately 85 degrees celsius.