2.17 A closed system consists of 0.5 lbmol of liquid water and occupies a volume of 0.145 ft$^3$. Determine the weight of the system, in lbf, and the average density, in lb/ft$^3$ and slug/ft$^3$, at a location where the acceleration of gravity is $g = 30.5 \text{ ft/s}^2$.