A mole of a monoatomic gas is subjected to a cyclic process as indicated by the volume pressure graph, where process A B is isothermal, B C is isobaric and C A is isocorneal. Leaving energies expressed in atm. L (beware of the value of the constant R) and without explicitly calculating the temperature (use the ideal gas state equation), find

a) (0.6 points) The work done by the gas on the environment in each process.

b) (0.6 points) Heat in each process. Indicate whether it is received or released by the gas.

c) (0.6 points) The variation of the internal gas energy in each process. Check the first law of thermodynamics for the complete cycle U ciclo = Q ciclo W ciclo.

d) (0.6 points) Changing the entropy in each process. Check S ciclo = 0

e) (0.2 points) Make a diagram of the entropy S as a function of temperature T.

f ) (0.4 points) Calculate the efficiency of this machine. (Answer: 0.21)

g) (0.4 points) Calculate the efficiency of a Carnot machine that works between the given temperatures. (Answer: 0.67)