Date Lab Sec. Name Desk No. L a. How is the pressure of the vaporized liquid det

Question

Date Lab Sec. Name Desk No. L a. How is the pressure of the vaporized liquid determined in this experiment? b. How is the volume of the vaporized liquid determined in this experiment? c How is the temperature of the vaporized liquid determined in this experiment? d. How is the mass of the vaporized liquid determined in this experiment? 2. The ideal gas law equation (equation 12.1)is an equation used for analyzing ideal gases. According to the kinetic mol- ecular theory that defines an ideal gas, no ideal gases exist in nature, only real gases. Van der Waals' equation is an attempt to make corrections to real gases that do not exhibit ideal behavior. Describe the type of gaseous molecules that are most susceptible to nonideal behavior.

Explanation / Answer

1.

a. Pressure of the liquid vaporized = atmosphereic pressure - water vapor pressure at that temperature

b. Volume of gas is determined by measuring the volume of flask by filling it with water and noting doen the water volume.

c. Temperature of the vaporized liquid would be the same as the boiling water temperature in which flask is immersed.

d. mass of vapoized liquid is determined by substracting the mass of flask with stopepr from the total mass after evaporation of liquid with flask and stopper.

2. Gases having strong intermolecular force of attraction between their molecules would be most affected by non-ideality. Say for example ammonia or water would having strong hydrogen bonding will show such behavior.

3. calculation

Volume = 0.152 L

Pressure = 0.989 atm

mass of vapor = 0.199 g

T = 98.5 + 273 = 371.5 K

R = gas constant

moles of vapor = PV/RT

                         = 0.989 x 0.152/0.08205 x 371.5

                         = 0.005 mol

molar mass of vapor = 0.199/0.005

                                  = 39.8 g/mol

4. a. If atmosperic pressure is 760 mmHg

molar mass of gas = 40 g/mol

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