Repeat Example 3.3, but assume that the ammonia, air, and water are brought into contact in a closed container. There is $10.0 \mathrm{~m}^{3}$ of gas space over the liquid. Assuming that the gas-space volume and the temperature remain constant until equilibrium is achieved, modify the Mathcad program in Figure 3.2 to calculate:

(a) The total pressure at equilibrium.

(b) The equilibrium ammonia concentration in both phases.

Data From Example 3.3:-

Ten kilograms of dry gaseous ammonia, NH₃, and 15 m³ of dry air measured at 300 K and 1 atm are mixed together and then brought into contact with 45 kg of water at 300 K in a piston/cylinder device. After a long period of time, the system reaches equilibrium. Assuming that the temperature and pressure remain constant, calculate the equilibrium concentrations of ammonia in the liquid and gas phases. Assume that the amount of water that evaporates and the amount of air that dissolves in the water are negligible. At 300 K and 1 atm, the equilibrium solubility of ammonia in air can be described with P_A = 10.51 atm, and the activity coefficient of ammonia given by (for xA

Figure 3.2:-

Transcribed Image Text:

YA = 3.5858x-0.622x +0.156 (3-6) A