Guideline of Homework10

Guideline of Homework10 - Guideline of Homework10 Problem 1...

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Guideline of Homework10 Problem 1 25.6, p. 793 Find ˆ f H H for CO 2 , H 2 O, C 5 H 2 ˆ f H H of elements = 0 & ˆ f H H of O 2 ,N 2 = 0 CO2 from the given reaction (based on formation of elements) H2O try to use some of given reactions. See example 25.1 in the book C5H2 use the equation for heat of reaction Problem 2 25.17, p. 797 Data: Use Appendix D1 for specific gravity and Appendix F for C H ˆ Chemicals sp gr LHV (kJ/g) MW HHV (kJ/gmol) Gasoline 0.84 40 - - Methanol Ethanol Stoichiometric relations Complete combustion of methanol and ethanol See section 25.4 in the book ( esp. paragraph at the bottom of page 786) Find HHV and LHV Find Energy density ratios = ( 29 ( 29 [ ] ( 29 ( 29 [ ] gasoline alcohol gasoline alcohol LHV gr sp LHV gr sp = ρ Percentage increases = 100 × - alcohol alcohol gas Problem 3 26.11, p. 830
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Assumptions 1. Few discharge is dry air with 79% N 2 and 21% O 2 , M W = 29 2. CH 4 enters at 80 ° F, 1 atm 3. Stoichiometry ( assume complete rxn) Overall mole balance Calculate n , from 1 1 1 1 pV n RT = Energy balance ( ˆ i H = absolute enthalpy)
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Guideline of Homework10 - Guideline of Homework10 Problem 1...

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