Question

An ideal gas, initially at 30°C (303.15 K) and 100 kPa, undergoes the following cyclic processes in a closed system:

(a) In mechanically reversible processes, it is first compressed adiabatically to 500 kPa, then cooled at a constant pressure of 500 kPa to 30°C (303.15 K), and finally expanded isothermally to its original state.

(b) The cycle traverses exactly the same changes of state, but each step is irreversible with an efficiency of 80% compared with the corresponding mechanically re versible process. Note: The initial step can no longer be adiabatic.

Calculate Q, W, AU, and AH for each step of the process and for the cycle. Take C_{P} = (7/2) * R and C_{V} = (5/2) * R

Answer 1

Answer:

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