76. We label the various states of the ideal gas as follows: it starts expanding adiabatically from state 1 until it reaches state 2, with V2= 4 m3; then continues on to state 3 isothermally, with V3= 10 m3; and eventually getting compressed adiabatically to reach state 4, the final state. For the adiabatic process 112 212pVpVγγ→=, for the isothermal process 2 →3 p2V2= p3V3, and finally for the adiabatic process 334434pV. These equations yield
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