A rigid, well-insulated tank contains air. A partition in the tank separates 12 ft^3 of air at 14.7 lbf/in^2 and 40F from 10ft^3 of air at 50lbf/in^2 and 200F. The partiion is removed and air from the two sides mix until a final equilibrium state is attained. The air can be modeled as an ideal gas, and kinetic and potential energy effects can be neglected. Determine the final temperature, in F, and pressure in lbf/in^2. Calculate the amount of entropy produced in Btu/R