A Piston Problem Twist
Consider the cylinder system shown in the figure below, which contains 1.5 g of air initially at 20°C and 120 kPa. At constant pressure, heat is then added to the air, raising the piston. The piston touches the spring when the air occupies a 2.5 liter volume. Heat in continually added until the air reaches a volume of 3.5 liters and a 2000K temperature. The universal gas constant is R(u) = 8.314 kJ/(kmol∙K) and the molar mass of air is 29 kg/kmol.
- How much work is done by the air?
- Sketch the process on a Pressure vs Volume diagram, labeling all the important states.