The Lighter Molar Mass Lab

OK. First things first. You get some very funny looks when you buy this many lighters at Giant Eagle . But, if you can push past that, and the occasional derogatory remarks, you have the beginnings of one of the very first inquiry labs I ever tried. I teach a lesson on the Ideal Gas Law, followed by a lesson on Dalton's Law of Partial pressures. As part of my Dalton's lesson, I do a demo where I collect the CO2 from a diet coke by water displacement so that kids see why we need to learn about Dalton's Law. Both lessons are followed by your standard practice problems, including one where we calculate molar mass of a gas. The next day in the lab I talk briefly about lighters and butane. I suggest that if we collect a sample of the butane, by taking it out of the lighter, we can make some measurements and calculate its molar mass. With just that short intro, I send them into the lab to develop a plan. I won't give them the lighter until t...