An insulated piston-cylinder device initially contains 0.3 m3 of carbon dioxide at 200 kPa and 27 oC. An electric switch is turned on, and a 110-V source supplies current to a resistance heater inside the cylinder for a period of 10 min. The pressure is held constant during the process, while the volume is doubled. Determine the current that passes through the resistance heater. (C&B) T2 = 600 K and I = 4.71 amp
One mole of an ideal gas at T = 25 °C is held in a cylinder by a piston at a pressure of 1 x 107 N m-2. The piston pressure is released in three stages,, first to 5 x 106 N m-2, thento1x106 Nm-2,andthento1x105 Nm-2. Calculate the work done by the gas during these irreversible, isothermal expansions. Compare this result to work done in a quasi-static (reversible), isothermal expansion from 1 x 107 N m-2 to 1 x 105 N m-2 at T = 25°C. W=5452JandWrev =11409.6J.