A vertical cylinder is fitted with a frictionless piston that is initially resting on stops. The cylinder contains carbon dioxide gas at 200 kPa, 300 K, and at this point the volume is 50 L. A cylinder pressure of 400 kPa is required to make the piston rise from the stops. Heat is now transferred to the gas from an aluminum cubic block, 0.1 m on each side. The block is initially at 700 K.
a) What is the temperature of the aluminum block when the piston first begins to rise?
b) The process continues until the gas and block reach a common final temperature. What is this temperature?
c) Calculate the net entropy change for the overall process.