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tutorial_9 - Indian Institute of Technology Kharagpur...

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1 Indian Institute of Technology Kharagpur Department of Mechanical Engineering Thermodynamics ME22002 Tutorial 9 (Thermodynamic Property Relations and Gas Mixtures) 1. Consider an ideal gas at 400 K and 100 kPa. As a result of some disturbance, the conditions of the gas change to 404 K and 96 kPa. Estimate the change in the specific volume of the gas using (a) Equation and (b) the ideal-gas relation at each state. Answer: 0.0598m 3 /kg. 2. Estimate the specific-heat difference cp _ cv for liquid water at 15 MPa and 80°C. Answer: 0.32 kJ/kg · K 3. Determine the enthalpy change and the entropy change of nitrogen per unit mole as it undergoes a change of state from 225 K and 6 MPa to 320 K and 12 MPa, (a) by assuming ideal-gas behavior and (b) by accounting for the deviation from ideal-gas behavior through the use of generalized charts . Answer: (a) 4.510 KJ/Kmol .K (b) 2979 KJ/Kmol, 5.341 KJ/Kmol.K 4. A rigid tank contains 1.2 m 3 of argon at -100°C and 1 MPa. Heat is now transferred to argon until the temperature in the tank rises to 0°C. Using the generalized charts, determine (a) the mass of
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