Air flows steadily through a constant-area duct. At section (1), the air is at 400 kPa (abs), 325K, and 150 m/s. As a result of heat transfer and friction, the air section (2) downstream is at 275 kPa (abs), 450 K. Calculate the heat transfer per kilogram of air between sections (1) and (2), and the stagnation pressure at section (2).