1. Briefly explain why it was not necessary for you to determine the mass of unknown liquid that you transferred to the flask before heating.

2. Would the molar mass of a volatile liquid, calculated using the procedure in this experiment, be incorrectly high, incorrectly low, or unaffected by the following procedural changes?

(a) You did not completely vaporize the liquid when you heated it.

(b) The foil cap got wet while you were cooling the flask and its contents with running water.

(c) You added the boiling stone to the flask after you had already determined the mass of the empty flask and foil cap.

(d) You forgot to measure the volume of the flask, so you used the volume printed on the flask for your calculations.

(e) Your unknown liquid had a boiling point of 102.3 Celsius.

3. The density of air at 100.0 deg. Celcius is less than 1.00g L^-1. Is it reasonable to assume that the vaporized liquid will force all of the air from the flask during heating? Briefly explain.