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Unformatted text preview: ME 212 HW 3 1) Two heavily insulated tanks are connected by a valve. Tank A has a volume of 5 m3 and initially contains oxygen at 15°C, 400 kPa. Tank B has a volume of 35 m3 and initially contains nitrogen at 35°C, 150 kPa. The valve is now opened and remains open until the resulting mixture comes to a uniform state. Determine a. The final pressure and temperature b. The entropy change for the process 2) Hydrogen and nitrogen are mixed in an adiabatic, steady flow process in the ratio 2 kmol of hydrogen per kmol of nitrogen. The hydrogen enters at 0.5 MPa, 20°C and the nitrogen enters at 0.5 Mpa, 200°C. The pressure after mixing is 0.49 MPa. Determine the temperature of the mixture and the net entropy change per kmol of mixture. 3) A room of dimensions 4 m x 6 m x 2.4 m contains an air –water vapor mixture at a total pressure of 100 kPa and a temperature of 25°C. The partial pressure of the water vapor is 1.4 kPa. Calculate: a. The humidity ratio. b. The dew point. c. The total mass of water vapor in the room. ...
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- Spring '08