A rigid, well insulated container with a volume of 2 ft^3 holds 0.12 lb of ammonia initially at a pressure of 20 lbf/in^2. The ammonia is stirred by a paddle wheel, resulting in an energy transfer to the ammonia witha magnitude of 1 Btu. For the ammonia, determine the initial and final temperatures, each in degree R, and the final pressure, in lbf/in2. Neglect kintect and potential energy effects.