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Macromolecules - Most Important Questions! (Download PDF)
1. Equal numbers of molecules with M1 = 10,000 and M2 = 100,000, are mixed. Calculate
- 2.0 × 105
- 4.0 × 105
- 6.0 × 105
- 5.0 × 105
3. A sample of serum globulin is placed in an ultracentrifuge which is operating a 50,000 rotations per minute (rpm). If the sedimentation coefficient of this protein is 7.1 × 10–13 s, how far will the solution boundary move in 30 minutes at a distance of 6.5 cm from the axis of rotation?
- 0.312 cm
- 0.229 cm
- 0.456 cm
4. A protein sample consists of an equimolar mixture of haemoglobin (M = 15.5 kg mol–1), ribonuclease (M = 13.7 kg mol–1) and myoglobin (M = 17.2 kg mol–1). Calculate the mass-average mass
5. A solution contains equal number of particles with molar and 10,000 g mol–1 and 20,000 g mol–1, respectively. Calculate.
6. A suspension contains equal masses of particles with molar masses 10,000 g mol–1 and 20,000 g mol–1, respectively. Calculate
- 14,456.6 g mol–1
- 19,999.9 g mol–1
- 15,555.5 g mol–1
- 13,333.3 g mol–1
7. Equal masses of polymer molecules with M1 = 10,000 and M2 = 100,000 are mixed. Calculate.
8. The intrinsic viscosity of myosin is 217 cm3 g–1. Calculate the approximate concentration of myosin in water which would have a relative viscosity of 1.5.
- 6.3 × 10–3
- 7.3 × 10–3
- 8.3 × 10–3
- 2.3 × 10–3
9. The Mark-Houwink exponent for poly(methylmethacrylate) has the value of 0.69 in acetone. Calculate the value of that would be obtained with the following molar mass distribution if the sample was studied by the viscosity measurement.
- 9.98 × 105
- 10.68 × 105
- 7.68 × 105
- 8.68 × 105
10. A hydroxyacid HO-(CH2)5-COOH is polymerized and it is found that the product has a number average molar mass of 20 000 g mol–1. What is the extent of reaction p?
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