Prbset01 - in a mechanically reversible process to 40 ° C...

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CHEMICAL ENGINEERING THERMODYNAMICS COURSE NO.: CHEG301 STUDENT: ___________________ COURSE: Thermodynamics INSTRUCTOR: Prof. Anderson SUBJECT: Problem Set 01 DUE: Wednesday, Oct. 29, 2007 1. For nitrogen, take C P = 29.1 J/mol- ° C and C V = 20.8 J/mol- ° C: (a) Three moles of nitrogen at 30 ° C, contained in a rigid vessel, is heated to 250 ° C. How much heat is required if the vessel has a negligible heat capacity? If the vessel weighs 100 kg and has a heat capacity of 0.5 kJ/kg- ° C, how much heat is required? (b) Four moles of nitrogen at 200 ° C is contained in a piston/cylinder arrangement. How much heat must be extracted from this system, which is kept at constant pressure, to cool it
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Unformatted text preview: in a mechanically reversible process to 40 ° C if the heat capacity of the piston and cylinder is neglected? 2. An ideal gas initially at 600 K and 10 bar undergoes a four-step mechanically reversible cycle in a closed system. Take C P = (7/2)R and C V = (5/2)R. (1 → 2) Isothermal expansion to 3 bar (2 → 3) Pressure decreases to 2 bar at constant volume (3 → 4) Volume decreases at constant pressure (4 → 1) Adiabatically compression to 10 bar (back to its initial state) (a) Sketch the cycle on a PV diagram. (b) Determine both T and P for states 1, 2, 3, & 4. (c) Calculate Q , W , ∆ U , and ∆ H (J/mol) for each step of the cycle....
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