ExampleProbSolnLect2ME525SP2011

- 1 ME 525 Example Problem Chemical Equilibrium Calculations A rigid tank with a volume of 500 m3 contains 65 kg of acetylene(C2H2 128 kg of

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1 ME 525 Example Problem: Chemical Equilibrium Calculations A rigid tank with a volume of 500 m 3 contains 65 kg of acetylene (C 2 H 2 ), 128 kg of oxygen (O 2 ), and 140 kg of nitrogen (N 2 ) at an initial temperature of 400 K. The mixture is ignited, burns, and reaches chemical equilibrium. The final temperature is measured to be 2500 K. Assume ideal gases, and note that the O 2 /N 2 ratio is different from that of air. The enthalpy of formation of C 2 H 2(g) is +226,730 kJ/kmol, and the constant pressure specific heat of C 2 H 2(g) is 1.69 kJ/kg-K. The molecular weights for C 2 H 2 , O 2 , and N 2 are 26.0, 32.0, and 28.0 kg/kmol, respectively. Assume that only CO 2 , H 2 O, H 2 , CO, and N 2 are present in significant concentrations at state 2. For the quadratic equation 2 0 ax bx c  , the solution is   2 42 xb b a c a  .
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2 (a) Calculate the initial and final pressures in the tank. (Answers: 76.49 kPa, 520 kPa) (b) Calculate heat transfer Q 12 to or from the tank. (Answer: -1.13x10 6 kJ) (c) Calculate the concentration of O 2
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This note was uploaded on 04/17/2011 for the course ME 525 taught by Professor Lucth during the Spring '11 term at Purdue University-West Lafayette.

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- 1 ME 525 Example Problem Chemical Equilibrium Calculations A rigid tank with a volume of 500 m3 contains 65 kg of acetylene(C2H2 128 kg of

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