Practice_Exam5

# Practice_Exam5 - c. (8) Write the set of combustion...

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ECH 3023 Practice Exam 5 Fall 2006 Open book and 1 page of notes. Show work for full credit. NAME:_________________________ 1. (40 pts) (a) (20) Calculate the HHV and LHV (kJ/g) of mixture consisting of 70 wt% acetone (C 3 H 6 O) and 30 wt% water. (b) (20) Calculate the adiabatic flame temperature T ad when the mixture (25oC) combusted with 100% excess air entering at 25 o C, 1 atm. Assume constant heat capacities, C p , for the gases below, if needed: H 2 O (g): 39 J/mol-K N 2 : 33 J/mol-K O 2 : 33 J/mol-K CO 2 : 49 J/mol-K CO: 31 J/mol-K C 3 H 6 O (g): 100 J/mol-K

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ECH 3023 Practice Exam 5 Fall 2006 2. (30 pts.) Consider below reaction: CH 3 OH (g) CH 2 O (g) + H 2 (g) a. (8) Write the set of formation reactions that sum to the above as the net reaction. (Show phases). b. (7) Calculate the standard heat of reaction of the above reaction from the tabulated heats of formation.
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Unformatted text preview: c. (8) Write the set of combustion reactions that sum to the above as the net reaction. (Show phases). d. (7) Calculate the standard heat of reaction of the above reaction from the tabulated heats of combustion. ECH 3023 Practice Exam 5 Fall 2006 4. (30 pts.) 2 mol % aqueous HCl (aq) at 25 o C is neutralized with 2 mol% NaOH (aq) at 25 o C. a. (15) Estimate the heat removed per mole NaCl (aq) formed to keep the neutralized solution at 25 o C. Assume the heat of solution of NaCl(c) is +3.5 kJ/mol. b. (15) Calculate the final temperature of the mixed solution if the solutions are combined adiabatically. Assume a constant heat capacity of 4.0 kJ/kg-K for the mixture....
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## This note was uploaded on 06/18/2008 for the course ECH 3023 taught by Professor Dickinson during the Fall '06 term at University of Florida.

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Practice_Exam5 - c. (8) Write the set of combustion...

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