> Problem 1 At low pressures there is a significant difference between the densities of liquids and of gases. For example, at 1 atm the densest gas known to us is uranium hexafluoride, which has a molecular weight of 352; its normal boiling point is 56.2C. Can you calculate its density in the gas phase at latm and 56.2C, assumes that it obeys ideal gas law? The least dense liquid is liquid hydrogen, which at its normal boiling point of 20 K has a density of 0.071 g/cm. Liquid helium also has a very low density, about 0.125 g/cm (at 4 K). What is the density of gaseous helium at its nbp? Can you suggest a couple liquids (with its density at normal boiling point) that can exist at latm at densities of less than 0.5g/cm Hint: you may refer to the Handbook of Chemistry and Physics. 25 pts a