Question

1. Calculate ??, ??, and the polydispersity index for a hypothetical polymer sample that contains equimolar amounts of polymer having molecular weights of 30,000, 60,000, and 90,000. 2. In question 1, change the words ’equimolar amounts’ to ’equal weights’ and recalculate. 3. A 0.5000 g sample of an unsaturated polyester resin was reacted with excess acetic anhydride. Titration of the reaction mixture with 0.0102 M KOH required 8.17 mL to reach the end point. What is the number average molecular weight of the polyester? Would this method be suitable for determining any polyester? Explain. 4. Calculate the freezing point depression, boiling point elevation, and osmotic pressure (in millimeters of water at 25°C) for 1.00% (w/v) aqueous solutions of three samples of a polymer having number average moleculat weights of 5000, 50,000, and 100,000. On the basis of your answer, what conclusions might you draw about the relative effectiveness of each method for determining molecular weight?

          1. Calculate ??, ??, and the polydispersity index for a hypothetical polymer sample that
contains equimolar amounts of polymer having molecular weights of 30,000, 60,000, and
90,000.

2. In question 1, change the words ’equimolar amounts’ to ’equal weights’ and recalculate.

3. A 0.5000 g sample of an unsaturated polyester resin was reacted with excess acetic
anhydride. Titration of the reaction mixture with 0.0102 M KOH required 8.17 mL to reach
the end point. What is the number average molecular weight of the polyester? Would this
method be suitable for determining any polyester? Explain.

4. Calculate the freezing point depression, boiling point elevation, and osmotic pressure (in
millimeters of water at 25°C) for 1.00% (w/v) aqueous solutions of three samples of a
polymer having number average moleculat weights of 5000, 50,000, and 100,000. On the
basis of your answer, what conclusions might you draw about the relative effectiveness of
each method for determining molecular weight?

1. Calculate ??, ??, and the polydispersity index for a hypothetical polymer sample that
contains equimolar amounts of polymer having molecular weights of 30,000, 60,000, and
90,000.

2. In question 1, change the words ’equimolar amounts’ to ’equal weights’ and recalculate.

3. A 0.5000 g sample of an unsaturated polyester resin was reacted with excess acetic
anhydride. Titration of the reaction mixture with 0.0102 M KOH required 8.17 mL to reach
the end point. What is the number average molecular weight of the polyester? Would this
method be suitable for determining any polyester? Explain.

4. Calculate the freezing point depression, boiling point elevation, and osmotic pressure (in
millimeters of water at 25°C) for 1.00% (w/v) aqueous solutions of three samples of a
polymer having number average moleculat weights of 5000, 50,000, and 100,000. On the
basis of your answer, what conclusions might you draw about the relative effectiveness of
each method for determining molecular weight?

Added by Patrick G.

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