A rigid, insulated tank initially contains 0.5 kg of carbon dioxide (CO2) gas at an absolute pressure of 150 kPa and a temperature of 20 C (State 1). The gas is stirred by a paddle wheel until the absolute pressure of the gas increases to 200 kPa (State 2). Assume that the surrounding pressure is 1 bar and temperature is 20 C. Consider variable specific heats for carbon dioxide. Do not interpolate; use the closest values.