Compressed nitrogen \((140 \mathrm{lbm}\) ) is stored in a spherical tank of diameter \(D=2.5 \mathrm{ft}\) at a temperature of \(77^{\circ} \mathrm{F}\). What is the pressure inside the tank? If the maximum allowable stress in the tank is \(30 \mathrm{ksi}\), find the minimum theoretical wall thickness of the tank.