Recent content by Hammertong

I know what molar mass is, but I don't understand how to get it from what I'm given. My teacher goes over the equations once then moves on. Then he expects us to be able to do it backwards, forwards, and sideways. I figured it out, I just needed to multiply my end answer by 22.4L to get weight...

A 125mL flask contains 0.239g of acetone vapor at 766mm Hg and 100*C. Calculate the molar mass of acetone. 766x125/373Kx273K/760=92.210mL .239g/92.210/1000=2.592g/mL Where am I going wrong? I have no idea if I'm anywhere close.