tutorial_9 - Indian Institute of Technology Kharagpur...

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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