A frictionless piston–cylinder device and a rigid tank initially contain 12 kg of an ideal gas each at the same temperature, pressure, and volume. We wish to raise the temperatures of both systems by 15°C. Determine the amount of extra heat that must be supplied to the gas in the cylinder, which is maintained at constant pressure to achieve this result. Assume the molar mass of the gas is 25.

A mass of 3 kg of saturated liquid-vapor mixture of water is contained in a piston-cylinder device at 200 kPa. Initially, 0.5 kg of water is in the liquid phase and the rest is in the vapor phase. Heat is now transferred to the water, and the piston, which is resting on a set of stops, starts moving when the pressure inside reaches 400 kPA. Heat transfer continues until the total volume increases by 10 percent. Determine (a) the initial and final temperatures, (b) the mass of liquid water when the piston first starts moving, and (c) the work done during this process. Also, show the process on a P−vP-vP−v diagram

A rigid tank initially contains an ideal gas at 100 kPa and 30 C. Heat is then transferred through the tank until the ideal gas is at 120 kPa and 80 C. The mass of the ideal gas is 0.9 kg. Assume that the constant pressure specific heat (Cp) of the ideal gas is constant and equal to 15 kJ/kg-K. Also, the gas constant (R) and the molar mass (M) of carbon dioxide are R = 0.35 kJ/kg K M = 44.01 kg/kmol %3D In the question that follows, select the answer that is closest to the true value. What is the change in entropy of the ideal gas during this process in units of kJ/K ?