Unformatted text preview: lower the mass of the gas and the volume collected also. Deciding if this has an impact on the results is a good thought exercise for students. It provides for some interesting discussion. Some people have questioned the assumption that the pressure inside the balloon is equal to atmospheric pressure. I have found several experiments online that report that after an initial peak when the balloon first expands, the values of the pressure inside and outside a balloon are within 0.2% of each other, for the volume used in this lab. http://scipp.ucsc.edu/outreach/balloon/labs/InflationExp.htm Again, the lab is far from perfect but presents a simple, economical way to use the Ideal Gas Law to calculate the molar mass of CO 2 and discuss lab error....
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- Winter '08