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1kg of superheated water vapor with a pressure of 1.5 MPa and a temperature of 500C is cooled in a frictionless piston-cylinder system at

 

1kg of superheated water vapor with a pressure of 1.5 MPa and a temperature of 500C is cooled in a frictionless piston-cylinder system at constant pressure until its temperature reaches 300C. Approximately how much kJ is the heat transferred to the water during the process?

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