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I got a new microphone (a Blue Yeti) and I love it. I also got a windscreen for it that should have been a suitable replacement for the pop filter I was using with my old microphone, but based on the audio recorded for this video, I don't think it works very well. The old pop filter's clamp doesn't fit the Blue Yeti, so I'm going to order another that does, which should improve the audio that I'll record for the next video.
In the final fractional distillation, after the first attempt went wrong, I heated the distillation flask more gradually, and it worked swimmingly.
I didn't bother weighing the unreacted p-DCB to factor into the calculations because of how much sublimated out of the condenser during the reaction.