The entropy of a closed system can change by the following two mechanisms: a)- entropy transfer due to the heat transfer b)-entropy generation caused by the factors of irreversibility. a)-true b)- false

Arigid tank contains 10 kg of air at 137 kpa (abs) and 21°c. more air is added to the tank until the pressure and temperature rise to 242 kpa (abs) and 32°c, respectively. determine the amount of air added to the tank. [r-0.287 kj/kg k]