Procedure: As a part of the PRELAB, answer the questions given here with * .

(1) Weigh the empty 250mL Erlenmeyer flask with a rubber stopper on.

* What are you calling this a mass of?

* What does this mass actually contain?

* What is the volume of the air inside?

(2) Obtain few small pieces of CO2(s) in the flask. The total amount should be close to the given rubber stopper in size. Let it sublime. Make sure the pieces are small enough so you can see them sing and dance. * What is sublimation?

* Should you have your rubber stopper on or off during the sublimation? Why?

(3) When sublimation is done, cap it with the stopper and weigh it. We are assuming that the container is completely filled with CO2 at this point.

* How can you be sure that there is no air left in the flask?

* How would you know if the sublimation is done?

* What does this mass contain

(4) Measure the temperature of CO2.

* are you losing some CO2 as you insert the thermometer into the flask?

(5) Fill the flask all the way to the rim with water and put the rubber stopper on. Water will spill over. Pour the water into 50mL/100mL graduated cylinder (multiple times) and measure the total volume of water.

* What is the relationship between volume of water and volume of CO2?

(6) Measure pressure of the air using the barometer on the wall.

* you are going to assume that the air pressure is equal to the CO2 pressure inside of flask. How/ When is this possible?

Reminder : Did you look for a qualitative observation that proves CO2(g) is denser than air?

Prelab Questions :

(PL1) Which is denser, CO2(g) or air? How do you know at this point?

(PL2) What is the molar mass of a compound if 2.600g of this gas filled 950.0mL of volume at 30.5C and 700.0Torr? Cleary show your work.

(PL4) Make a list of chemicals used in the lab (with both name and formula of compound).

(PL5) Make a list of equipment used in the lab.