A mole of ideal gas at an initial temperature of 298 K expands from a pressure of 5 atmospheres to a pressure of 1 atmos

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A mole of ideal gas at an initial temperature of 298 K expands
from a pressure of 5 atmospheres to a pressure of 1 atmosphere. In
each of the following cases:
1. isothermal and reversible expansion
2. isothermal and irreversible expansion
3. Adiabatic and reversible expansion
4. adiabatic and irreversible expansion
Calculate: a) the final gas temperature
b) the variation of the internal energy of the gas
c) the work done by the gas
d) the amount of heat involved
e) the enthalpy change of the gas (Cv = 3R/2 and Cp = 5R/2)