(a) Calculate the density of sulfur hexafluoride gas at 707 torr and 21oC.
For the density of an ideal gas, we have
molar mass of SF6 (remember molecular compounds?:)
(b) Calculate the molar mass of a vapor that has a density of 7.135 g/L at 12oC and 743 torr.
same drill, but we solve for molar mass M