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Biotransport Assignment
1. A drug has an equilibrium solubility in water of 0.0025 g cm^-3. The diffusivity of the drug in water is 0.9 x 10^-5 cm2/sec. The drug is made into particles that have a radius of 0.1 cm and these particles have a density of 1.27 g/cm^3. These particles are all of the same size and are gently mixed in water in a stirred vessel. Estimate the length of time in hours (hrs) that it will take for these drug particles to completely dissolve. You can assume that the vessel volume is so large that the concentration of the drug in the bulk liquid is very small in comparison to the drug solubility. Also since the particles are all the same size, the time to dissolve is the same for all the particles. So we can focus on just one particle and write an unsteady mass balance on that particle, i.e., d(ρV)/dt = - 4πR^2 km (Csurface - 0) , where V is the particle volume and equals 4/3 πR^3 .
2. A particular drug is a solid at 300 K and is soluble in water. The equilibrium solubility of the drug in water is 0.005 g cm-3. The MW of the drug is 600. One hundred grams of the drug is made into particles that are 0.2 cm in diameter. The density of the drug particles is 1.05 g cm-3. These particles are then very gently mixed in a stirred vessel containing 100 L of water. After 10 min of mixing, estimate how many grams of the drug have dissolved into the water.
3. A flat plate coated with a layer of a volatile organic material is exposed to a parallel flow of air at 20°C with a free stream air velocity of 5 m sec-1. The length of the flat plate in the direction of flow is 0.5 m. Estimate how long it will take for the average thickness of the volatile organic layer to decrease by 1 mm. The saturation concentration of the organic material in air at these conditions is 1.85 × 10-9 mol cm-3 and its diffusivity in air is 0.068 cm2 sec-1. The density of the volatile organic material as a solid is 1.21 g cm-3 and its MW is 140.2. Also, the kinematic viscosity of air at these conditions is 0.155 cm2 sec-1.
A solution is prepared by mixing 85.0 mL of 5.00 M HCl and 25.0 mL of 8.00 M HNO3. Water is then added until the final volume is 1.00 L. Calculate [H+], [OH -], and the pH for this solution.
whose temperature is 95 C and which contains 130g of liquid. Assume the specific heat capacity of the coffee is the same as that of water. The heat of fusion of ice
a buffer solution is made by dissolving 0.45 moles of a weak acid ha and 0.33 moles of koh into 800 ml of solution.
Consider the titration of 80.0 ml of 0.100 M Ba(OH)2 by 0.400 M HCL. Compute the pH of the resulting solution after the following volumes of HCL have been added.
A copper cube measuring 1.58cm on edge and an aluminum cube measuring 1.68cm on edge are both heated to 56.4 degrees C and submerged in 100.0mL of water at 21.6 degrees C. What is the final temperature of the water when equilibrium is reached? (As..
If a reaction mixture contains only N2O and NO2 at partial pressures of 1.0 atm each, the reaction will be spontaneous until some NO forms in the mixture.
If a 0.135g sample of NaCl were placed on an ion-exchange column in the H+ form and the eluate titrated with 0.1231 M NaOH, what volume of the NaOH solution would be required to reach a phenolpthalein end point
Calibration standards. Transfer 1.00, 5.00, 10.00, 15.00 and 20.00 mL aliquots of 10ppm F- solution to 100 mL flasks. Add 50 mL of TISAB containing CDTA to each
Define that you are given 2500 atoms of the isotope 222RN. If 600 atoms of 222Rn remain after 7.87 days, explain what is the half-life of 222Rn? In radioactive decay the number of nuclei can be substituted can be substituted for concentration
Draw the following molecule and its ring flipped conformer in the chair conformation on a sheet of paper: trans-1-chloro-2-methylcyclohexane
a experiment would also work using another reactive metal such as zinc.If you had used the same number of grams of Zn as you did Al in this experiment,would you have obtained more or less hydrogen. Illustrate with an equation and calculation
What is the balanced equation for the complete combustion of 2,2,4-trimethylpentane? Show how butane can be converted to 2,2,4-trimethylpentane using petroleum refining processes
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