1. The following table illustrates the variation of pressure and volume in the cylinder of an internal combustion engine during the expansion process. Plot the data on a P-V diagram and determine the work done in kJ. Is this exact or an estimate? Why? Data point Pressure (kPa) Volume (cm³) 2000 400 2 1600 490 1200 620 990 730 5 600 1120 6 300 1930 2. An ideal gas is 45 psi and 80°F is heated in a closed container to 130°F. What is the final pressure? 3. A large mining company was provided with a 3000 cm³ of compressed air tank. Air Pressure in the tank drops from 700 kPa to 180kPa while the temperature remains unchanged at 28°C. What percentage has the mass of air in the tank been reduced?