A heat engine with 0.221 mol of a monatomic gas undergoes the cyclic procedure shown in the ?? diagram, where ?1=360 kPa, ?2=480 kPa, ?1=1.52×103 cm3, and ?2=2.34×103 cm3. Between Stage 3 and Stage 1, the gas is at a constant temperature, and between Stage 2 and Stage 3, no heat is transferred in or out. The temperature of the gas at Stage 2 is 400 K.       What is the temperature ? between Stages 3 and 1? ?=     K   What is the work ?out per cycle of this heat engine? ?out=     J   Find the efficiency ? of this heat engine. ?=

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