Applying the Energy BalanceA rigid, well-insulated

QUESTION:

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