Volatile Thursday

So on thursday we were supposed to vaporize an unknown gas at atmospheric temperature and then figure out it's molar mass. Apparently they choose the wrong sample, which had a higher vaporization point than what we could achieve. So our teacher had us just do the calculations with the known error on the first "trial" and on the second trial she gave us the right answer and told us to work backward.

The chemical reflected line when submerged, it was so cool looking.