An 82.3-ft3 tank contains water vapor at 1500 lbf/in.2, and 1140 R. If the pressure, , specific

An 82.3-ft3 tank contains water vapor at 1500 lbf/in.2, and 1140° R. If the pressure, ρ, specific volume, υ, and temperature, T, of water vapor are related by the expression.
ρ = [(0.5954) T / (υ – 0.2708)] – (63.36)/ υ2
Where υ is in ft3/lb, T is in °R, and ρ is in lbf/in.2. Determine the mass of water in the tank also, plot pressure versus specific volume for the isotherms T=1200, 1400, and 1600°R.