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HW7 - needs to be extrapolated from Table B.8 4 Chapter 8...

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CBE2124 – Analysis of Chemical and Biological Processes Homework No. 7 1. Chapter 8, problem 15 . Note that answer to part c in the solutions should be more specific, i.e. the difference between methods (i) and (ii) is in the nonideal corrections to the enthalpy. In particular, for real gases enthalpy also depends on pressure; this dependence is not accounted for by method (ii) but is included in method (i). Still, as you can see from the results, the ideal assumption is an excellent approximation in this case. 2. Chapter 8, problem 36 . Note: heat capacities can be looked up in Table B.2. 3. Chapter 8, problem 49 a-c . The main goal of this problem is to understand how to set up the equations. Doing so is a little bit of a review of Chapter 6 as well. In the HW solution for this problem, note that the third column in the enthalpy table should say out n & and out H ˆ at the top. The text uses tables like these to list the enthalpies that need to be calculated for the energy balance. Also, note that enthalpy of air
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Unformatted text preview: needs to be extrapolated from Table B.8. 4. Chapter 8, problem 57 . Note: this problem makes use of Kopp's Rule to estimate heat capacity of acetic anhydride. Also, while the problem asks you to estimate the latent heat of vaporization for acetic anhydride, you don’t need it to solve the problem. 5. Chapter 9, problem 7a-c . Heats of formation are tabulated in Table B.1. 6. Chapter 9, problem 12 . 7. Chapter 9, problem 63 . This problem is a combined material/energy balance problem. Standard heats of combustion reactions can be calculated from standard heats of formation or looked up directly from Table B.1. Note: adiabatic flame temperature is the temperature reached by the product stream from a combustion reaction when the reactor operates adiabatically. Since no heat from the combustion is lost through the reactor walls, all of the heat released by the reaction goes toward heating the product stream....
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