Midterm 1 2008

Midterm 1 2008 - 1 bar AU I? [I II I? I | Chemistry 440...

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Unformatted text preview: 1 bar AU I? [I II I? I | Chemistry 440 Hour exam . . u . u o . n . . . . . . . . . . n . . n n . . . . . . . o . o . . . u . . . . . . . . . . . n .- Department of Chemistry, Oregon State University 22 October 2008 8 J/(K - mol) 2 0.08 L - atm/(K - mol) 105 Pa 1 bar = 1.0 atm Qby + won 2 qby _ /Pe:1:th Tlf/l’Y-l : TngV-l 1+4$+10x2+20$3~~ P pRT adiabatic process 7 : Vm<1 p: 2 V g 20 1. (10 pts) The density of a gas, presumed to be ideal, is 1.0 g/L at 300K and 190 torr. What is the molar mass of the compound? 2. (10 pts) If the J oule-Thomson coefficient MT 2 1.25 mK / bar, What pressure differential is needed to cause a 10 K drop in temperature? "5 3. Consider a fluid Whose pressure obeys PRT 2 P: —— — (raw a" where (1,1) are constants. Calculate (a) (10 pts) the second and third virial coefficients; (b) (5 pts) and, the Boyle temperature (at which the second Virial coefficient van- ishes). 30 4. One mole of nitrogen gas (C1, = (5 / 2)R) with an initial temperature of 300 K expands reversibly from an initial volume of 1 L to 10 L. ' ...AU (kJ) ...q,,y (kJ)... ...wby(kJ)... (a) (12 pts) Calculate the entries in the Table if the process is isothermal. (b) (12 pts) Calculate the entries in the Table if the process is adiabatic. Hint: (1/10)<2/5) 2 0.4 (c) (6 pts) In which of the two expansions does the gas do the most work and why? I 5. (10 pts) Prove that 0,, — CU i R for one mole of an ideal gas, stating all assumptions and starting from the definition of the enthalpy. 6. (10 pts) When 200 J of energy are supplied to 2.0 moles of Ar under conditions of constant pressure, its temperature rises by 5 K. What are the molar heat capacities, CU and CP in units of R? 20 7. (10 pts) Show that . dqm = dH — VdP starting from the First Law of Thermodynamics for a reversible process. dedU-i-PdV-rVOW, OUT: deV ~PdV FEM q revWSQLL WOW 09Hde m Pgw + 99w +\/0H’ sl. 2 8. (10 pts) dqm, / T is an exact differential. Express quev/T as a function of H and P, and from this result, determine (am/m) _ 8P H ...
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This note was uploaded on 12/24/2011 for the course CH 440 taught by Professor Staff during the Spring '08 term at Oregon State.

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Midterm 1 2008 - 1 bar AU I? [I II I? I | Chemistry 440...

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