We have a container of a hot ideal monatomic gas. The volume of the container is 25 liters. The temperature of the gas is 470 'C, and its pressure is .858*10^5 Pa. We allow the gas to cool down to room temperature, which at the time is 21'C. we do not allow the volume of the gas to change.
(a) find the final pressure of the gas.
(b) Find the amount of heat that passed from the gas to its surroundings as it cooled.
(c) Find the change of internal energy of the gas.