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Water in a piston-cylinder assembly is at 1 MPa, 500◦C. There are two stops, a lower one at which Vmin = 1 m3 and an upper one at Vmax = 3 m3. The piston is loaded with a mass and outside atmosphere such that it floats when the pressure is 500 kPa. This setup is now cooled to 100◦C by rejecting heat to the surroundings at 20◦C. a. Show the path of the process on T-V and P-V diagrams. b. Determine the heat transferred and work done during this process.
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are gas particles distinguishable or indistinguishable
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Water flows at 20 cm^3/sec through a long straight tube that has an inner diameter of 1 cm. As the water flows, a toxin leaches from the tube into the water. At the inner surface of the tube, the toxin attains its saturation concentration, Csat = 2 mM. Fortunately, upon entering the water the toxin also irreversibly degrades into a non-toxic compound; this degradation follows first-order kinetics.
Toxin Diffusivity D = 10^-5 cm^2/sec
Toxin mass transfer coefficient k = 1.38 X 10^-3 cm/sec
Toxin degradation rate constant k1= 5.5 X 10^-3/sec
In order to evaluate whether the water is still safe to drink, we need to know the limiting concentration of the toxin? (In other words, what concentration does the toxin approach as the length of the tube approaches infinity)
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a) Calculate the mean free path of a gas with an average speed of 10 m/s with collision frequency of 10 s-1. b) Calculate the mean free path of a gas with a density of 10 particles/cm3 and molecular diameter of 0.1 nm. c) Calculate the mean free path of a gas in a 1 cm3 container with 10 molecules and molecular diameter of 0.1 nm.
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Experiment data taken in a batch reactor predicted the CSTR conversion should be 50%. However, the concentration measured in the actual CSTR was 57%. Suggest a reason for the discrepancy between the predicted and measured conversion.
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Assign oxidation states to each of the atoms in the reactants and products listed below. Then balance the equation using the oxidation state method. What is being oxidized and reduced? What is the oxidizing agent and the reducing agent?
H2C2O4(aq) + MnO41-(aq) + H+(aq) ---> CO2(aq) + Mn2+(aq) + H2O(l)
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a.) Speculate which variable: (a) reaction temperature, (b) conversion of monomer or (c) reaction mixture viscosity, would be the most important for tuning the degree of short chain branching in the high pressure process for making polyethylene using a batch reactor. Explain your reasoning.
b.) why is low density polyethylene (LDPE) low density?
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The stream function in cylindrical coordinates for a two-dimensional flow is given by:
Ψ = [(a)(r) + (b)/(r)] Sin ϴ
Where “a” and “b” are constants.
a)Does this flow satisfy the continuity?
b)Determine the corresponding velocity potential in the polar coordinate system.
c) Is this flow irrotational? Why?
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Propanol is burned with excess air to produce a mixture of comstock gases. The burner feed consists of 600 kh / h of propanol and 8700 kg / h of air. It is found that the total conversion of propanol is 90%. 95% of the propanol is burned through the complete reaction and the rest through incomplete reaction.
A. Determine the stoichiometry
CH3CH2CH2OH+ _O2---> _CO2+ H20
CH3CH2CH2OH+_O2 ---> _CO2 +_H20
B. LImitint reagent.
C. Excess reactive and %excess.
D. The molar composition on a humid base of the combustion gases% molar
E. The molar composition of the free gases of water vapor, % molar.
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What is the importance of studying the activity coefficients? Specifically of tributyl phosphate dissolved in kerosene
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How are specific technologies used differently by different art/design practices? How do these differences demonstrate: (1) in how a practice defines or approaches that technology in the first place and (2) uses it to reveal and present different sorts of ideas and works? Please choose a specific technology (1860 or later) and discuss the history of its appearance and development. Discuss in some detail how (at least) two clearly dissimilar art/design practices have approached, employed, and/or critiqued that same technology. Give examples of specific works and specific writing by 2-3 different artist/designers. What are the ideas and arguments they have at stake? Some suggestions for core technologies: celluloid film, database, magnetic tape, video, white box gallery, incandescent and crepuscular light, software.
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What factors are required for the accumulation of hydrocarbons?
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