The following data apply to a 1g sample of a granular powder Volume of the solid alone = 1 cm3/2g Volume of intraparticle pores = 0.2 cm3/1g Volume of spaces between particles = 3.2 cm3/2g Volume after tapping = 1.4 cm3/1g What is the bulk volume?
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The following data apply to a 1g sample of a granular powder
Volume of the solid alone = 1 cm3/2g
Volume of intraparticle pores = 0.2 cm3/1g
Volume of spaces between particles = 3.2 cm3/2g
Volume after tapping = 1.4 cm3/1g
What is the bulk volume?
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- Calculate the surface excess of solute given the following data:Molar concentration in bulk solution as prepared:0.100 mol dm-3Molar concentration in bulk solution as determined:0.981 mol dm-3Total volume of solution: 100 cm3Radius of beaker containing the solution: 2.50 cmTrue or False According to Kolrausch’s law of independent ionic migration, the molar conductivity of an electrolyte is equal to the sum of the molar conductivity of its constituent ions.Estimate the diffusion coefficient of the Na+ and Cl− ions in water at 298 K from the molarconductivity at infinite dilution, Λ??∞ (NaCl) = 138.46 S cm2 mol−1 and the transport number,t(Na+) = 0.377. Calculate the mean distance travelled by Cl− ions over a 7 hour period.Question 7Describe the structure and nature of the ionic atmosphere about an ion. Explain whathappens to the ionic atmosphere in the presence of an electric field.
- Do the conclusion to polymer molecular weight determination by dilute solution viscosity measurement.What is the diffusion coefficient of a membrane-bound protein of molar mass 79,300 daltons at 37°C if the viscosity of the membrane is 1 poise (0.10 N-s-m-2)? Assume that this protein is an unhydrated, rigid sphere that has a density of 1.4 g-cm-3. 4.0 8.05e-12 x m².s-1 What is the average distance traveled by this protein in 2.3 s? 4.0 6.085e-6 x ÅDefine the 3 kinds of diffusion/dispersion processes and give one environmental example of where it may be the dominant dispersion process.
- Calculate the end-to-end distance of a polymer with a molecular weight of 1 million and an intrinsic viscosity of 2.10dl/g and assume Φ=2.1*10^21. What is the solution behavior of the polymer?How does the melt temperature of the main phase affect diffusion?The osmotic pressure of a solution of polystyrene in toluene (methylbenzene) was measured at 25 °C with the following results: c/(g dm− 3) 2.042 6.613 9.521 12.602 P/Pa 58.3 188.2 270.8 354.6 Determine the molar mass of the polymer. Molar Mass = __________ kg/mol.
- Calculate the viscosity of a liquid sample of density 1.2 g/cm3 ,taking into account that a metallic sphere of density 8.1 g/cm3 and 10 mm diameter takes 8 seconds to move one meter.The sedimentation coefficient for a protein in solution is determined to be 4.3 S, and the diffusion coefficient to be 5.5x10-11 m2s-1 (vb = 0.74 mLg-1; density = 1.0 gmL-1; and viscosity = 1.0x10-3 Pas-1). Use this information to calculate the molar mass (kgmol-1) of the protein. Assume temperature of 298 K.Asample of 2.05 g of polystyrene of uniform polymer chain length was dissolved in enough toluene to form 0.100 Lofsolution. The osmotic pressure of this solution was found to be 1.21 kPa at 25°C. Calculate the molar mass of thepolystyrene.a) 2.35 x 104 g/molb) 4.20x 105 g/molc) 3.05 105 g/mold) 4.20x 103 g/mole) 4.20 x 104 g/mol