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A box has two compartments of equal size. One side there are 6 moles of hydrogen gas and the other has 2 moles of nitrogen gas. The box is kept at 20C and the barrier between the two compartments is removed. Assume ideal gas behavior and calculate Gibbs energy when allowing the gases to mix.
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Consider a mid-size city of 3,000,000 people in the Cairo city . Suppose that its residents produce, on average, 6.0 kg a day of MSW. At present this waste is being hauled 180 miles away (in a southeasterly direction) where it is being used to fill in an abandoned open pit nickel mine. The mine and deposited wastes abut a shallow marine embayment. Seaweed, shellfish, crustaceans, and fish are harvested from this embayment and eaten by both the local fishermen and their families as well as by the residents of the city.
Facts about the waste:
55 % of the waste is composed of agricultural waste and household non-sewer organics
35 % of the waste is household waste, including paper, glass and plastics
10 % of the waste is a combination of metal, wood, chemical, petroleum, and other miscellaneous materials.
Calculate how much methane could be generated from the anaerobic decay of the landfill waste over a 10 year time period. What, if anything, could be done with this methane? Would more, less, or the same amount of methane be produced if the waste was simply incinerated? Which waste disposal method provides the biggest threat to environmental sustainability and human health? Explain your answer.
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Pure water at 26.1 degres celcius flows at the rate of 5.514x10^-7 m^3/s through a packed bed of benzoic acid spheres having a diameter of 6.375 mm. The total surface area of the spheres in the bed s 0.01198m^2 and the void fraction is 0.436. The tower diameter is 0.0667m. The solubility of benzoic acid is 2.9488x10^-2 kg mol/m^3.
a. What is the mass tranfer coefficient?
b. What is the outlet concentration of benzoic acid in the water?
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Your engineering consulting firm has been retained to develop an absorption process that removes 98% of the SO2 from an air stream. The column operates at 30 oC and 5 atm. The design assumes 250 mol/min of an air stream contaminated with 10 mol% SO2 fed to the bottom of the column. Regenerated absorbent is fed to the top of the column. The absorbent is an aqueous solution, where the absorbent species is non-volatile. Some water will vaporize based on its vapor pressure at 30 oC (approximately 35 mmHg), so the treated gas will contain air, residual SO2, and water vapor. The absorbent stream leaving the column contains SO2 in a molar ratio of 15:1 (solvent:SO2). The absorbent is recovered in a stripping column operating at 120 oC and 2 atm. The stripping gas is 250 mol/min steam which is fed to the bottom of the stripping column and removes 98% of the SO2. Some of the steam condenses in the absorbent phase at a ratio of 2:1 (aqueous solvent:condensate). The absorbent is non-volatile, so the exiting steam only contains water and SO2. Your task is to analyze this process. Follow the problem solving procedure outlined in your notes and the textbook. You must: prepare a fully labeled process flow diagram, conduct a degree of freedom analysis on each system (overall, absorber, and stripper), clearly identify unknown variables and units, write all appropriate equations (materials balances, etc.) needed to solve for the unknowns, solve the problem.
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In a hypothetical experiment, electrical current of 15 AMPs driven by an applied potential of 100 volts passes through a cylindrical rod (3 mm in diameter and 7 cm long). Recall, the power is calculated by power(Watts) = potential(VOLTS) x current(AMPS). The electrical power heats the cylindrical rod to a high temperature. The rod is inside of a ceramic tube (ID = 12 mm). The wall temperature of the ceramic tube is 600 C (maintained at this stead temperature by air cooling on the outside). Assuming that convection and conduction between the resistor and the ceramic tube are negligible compared to thermal radiation, estimate the surface temperature of the rod. The emissivity of the ceramic tube is 0.9 and the emissivity of the resistor is 0.8.
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A mixture containing 20 mole % butane, 35 mole % pentane and 45 mole % hexane is to be separated by fractional distillation into a distillate product with a composition 95 mole % butane, 4 mole % pentane and 1 mole % hexane, and a bottoms product. The recovery of butane in the distillate must be 90%. Determine the composition of the bottoms product.
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What effect will methanol have on the rate of reaction of sodium phenoxide with ethyl iodide? is this a good solvent for this type of mechanism? why do you think this solvent is used
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Gasoline is used n internal combustion engines.Given composition by weight (octane 22,heptane 35,benzene 28,ethanol 10,MTBE 5). MW(Octane 114.23,heptane 100.21,benzene 78.11,ethanol 46.07,MTBE 88.15).Litre of fuel used:2000 litres(annually) (200km for 5 working days).Average density of gasoline=0.75kg/L
Assuming ideal gas behaviour for the exhaust gases,calculate the volumetric flow rate of exhaust gas for a trip (11.1km) on a given day?Assume 30% excess air intake.
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What factor does not affect the distribution of different isozymes?
Select one:
a. Different metabolic patterns in different organs.
b. Different locations and metabolic roles for isozymes in the same cell.
c. Different stages of development in embryonic or fetal tissues and in adult tissues.
d. Different catabolic abilities using commonly evolved amino acid sequences
e. Different responses of isozymes to allosteric regulation
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By means of a dimensional analysis, verifies that the dimensionless numbers corresponding to mass, energy and moment have no dimensions.
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