$14-122$ A $1\mathrm{.}8-m^3$ tank contains saturated air at $20C$ and $90$ kPa $.$ Determine $(a)$ the mass of the dry air, $(b)$ the specific humidity, and $(c)$ the enthalpy of the air per unit mass of the dry air. Answers: $($a$)1\mathrm{.}88$ kg $,($b$)0\mathrm{.}0166kg{H}_2\frac{O}{k}g$ dry air, $($c$)62\mathrm{.}2k\frac{J}{k}g$ dry air