We had a lab in which we added 2 ml of isoprobyl alcohol to a flask and heated as there was a piece of aluminum with a small hole covering the opening of the flaskThen we had to calculate the molecular mass using the data we had gottenBarometric pressure-764 mm Volume of flask- 144.5 ml mass of alcohol- .37 g and temperature of boiling water 100 CelsiusMy question is why is it not necessary to add exactly 2 ml of isoprobyl alcohol to the flask?
The 2 mL is actually more than is needed to completely fill the flask, pushing all the air out of the flaskThe extra alcohol escapes out the hole in the aluminum foil, leaving behind exactly one flask-ful of vaporSince there is extra alcohol, there is no need to be exact with the amount.
