This preview shows page 1. Sign up to view the full content.
Unformatted text preview: er 16
Analysis This is a dissociation process that is significant at very high temperatures only. For simplicity we consider 1 kmol of H2, as shown in Fig. 168. The stoichiometric and actual reactions in this case are as follows:
Initial composition 1 kmol H2 |
Equilibrium composition 10 atm 0.9H2 0.2H 799 Stoichiometric: Actual: H2 H2 2H 0.9H 2 123
reactants (leftover) 1thus nH2 0.2H 1 3 2
products 1 and nH 22 FIGURE 168 Schematic for Example 162. A double-headed arrow is used for the stoichiometric reaction to differentiate it from the actual reaction. This reaction involves one reactant (H2) and one product (H). The equilibrium composition consists of 0.9 kmol of H2 (the leftover reactant) and 0.2 kmol of H (the newly formed product). Therefore, NH2 0.9 and NH 0.2 and the equilibrium constant KP is determined from Eq. 1615 to be KP N nH P nH H b nH a N H2 N total
2 nH2 10.22 2 0.9 a 10 0.9 0.2 b 2 1 0.404 From Table A28, the temperature corresponding to this KP value is T 3535 K Discussion We conclude that 10 p...
View Full Document
- Summer '08