Fun with PV=nRT and density?
You do not - in fact cannot - use gas law equations when you deal with a liquid . To solve your problem : 1.0atm = 760mmHg A column of mercury 1000mm high exerts a pressure of 1000/760 = 1.3158 atm Density of Hg = 13.6g/mL Density of Br2 = 3.03g/mL Pressu...