Unformatted text preview: 304 kPa. Determine the equilibrium composition, assuming the mixture consists of CO2, CO, and O2 (Fig. 1612). Initial composition 2 kmol CO 3 kmol O2 Equilibrium composition at 2600 K, 304 kPa x CO2 y CO z O2 Solution A reactive gas mixture is heated to a high temperature. The equilibrium composition at that temperature is to be determined. FIGURE 1612 Schematic for Example 163. 802 | Thermodynamics
Assumptions 1 The equilibrium composition consists of CO2, CO, and O2. 2 The constituents of the mixture are ideal gases. Analysis The stoichiometric and actual reactions in this case are as follows: Stoichiometric: Actual: CO 2CO 1 2 O2 CO2
123 1thus nCO2 yCO
reactants (leftover) 1, nCO zO2 1, and nO2 1 22 3O2 xCO2
products 1552553 C balance: O balance: 2 8 x 2x y y N total P 2z x or y or z y z 2 3 5 x x 2 x 2 Total number of moles: Pressure: 304 kPa 3.0 atm 1 O2, for which The closest reaction listed in Table A28 is CO2 CO 2 ln KP 2.801 at 2600 K. The reaction we have is the inverse of this, and thus ln KP 2.801, or KP 16.461 in our case. Assuming ideal-gas behavior for all components, the equilibrium const...
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