quiz_08 - EML 5104 Classical Thermodynamics, Spring...

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Unformatted text preview: EML 5104 Classical Thermodynamics, Spring 2010 Quiz 8, 24 March 2010 Name (Print): ___________________________________ UF ­ID: ___________________________________ Please sign the honor pledge: "On my honor, I have neither given nor received unauthorized aid in doing this assignment." _________________________________ Signature Only mark one of the multiple choice answers. Use additional paper if necessary. Q1: The humidity ratio is given as ω=mv/ma. Use the ideal gas law and the Dalton model to derive an expression for ω in terms of the partial vapor pressure pv, the total pressure p, and the molecular masses of water and air Mv, and Ma, respectively. (2P) Q2: If Tas is the adiabatic saturation temperature and Tdb is the dry bulb temperature (inlet temperature to the adiabatic saturator which statement is always true? (2P) a) Tas ≤ Tdb b) Tas = Tdb c) Tas ≥ Tdb d) Tas may be smaller or larger than Tdb Q3: What is the condition for Tas = Tdb? (2P) Q4: The molar analysis of a mixture is yCH4=0.6 and yC2H2=0.4. Use Kay’s rule to determine the mixture’s pseudocritical state (Tc,mix, pc,mix). Tc,CH4 = 191 K, pc,CH4 = 46.4 bar, Tc,C2H2 = 309, pc,C2H2 = 62.8 bar. (2P) Turn page! EML 5104 Classical Thermodynamics, Spring 2010 Q5: Which of the below is a partial molal property (2P)? a) b) c) d) ∂U ∂ni ∂H ∂ni ∂A ∂ni ∂G ∂ni S ,V , nl S , p , nl T ,V , nl T , p , nl Q6 Why? (Justify your answer in Q5) (2P) Q7: In oxyacetylene welding pure oxygen is reacted with Acetylene. Assuming complete combustion, give the reaction equation. (2P) Q8: Why is pure oxygen used instead of air for welding? (2P) Q9: Give an implicit Equation for the adiabatic flame temperature. Assume the reactant and product compositions and enthalpy (nR, hR(T), nP, and hP(T) respectively) are known. (2P) Q10: Give an expression for the maximum work that may be retrieved from a reaction. Assume the reactant and product compositions, enthalpy, and entropy (nR, hR(T), sR(T,p), nP, hP(T), and sP(T,p) respectively) are known. (2P) Points: _______/ 20 P Turn page! ...
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