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Extensive measurements of the gel point were performed by Flory using diethylene glycol and adipic acid in the presence of different amounts of 1,2,3-propanetricarboxylic acid. One run was performed under the following conditions: 0.5 mol. adipic acid, 1.0 mol. diethylene glycol and 0.20 mol. 1,2,3-propanetricarboxylic acid. a. According to the Flory theory of gelation, at what extent of reaction, pA (with respect to the carboxyl groups) is the gel point reached? (10 points) b. Gelation was experimentally observed at pA = 0.991 (i.e. when 99.1% of the carboxyl groups had reacted). How does this extent of reaction compare with the predicted value of part a? At the gel point, what is the experimental value of the branching coefficient, c? (10 points) c. What is the number average degree of polymerization at the theoretical gel point which is predicted by the theory? (10 points) Hint: Use the regular definition of the number average degree of polymerization, ; x n (x n )t = Total # of structural units in system Total # of molecules @ time t
What mass of silver chloride can be produced from 1.70 L of a 0.177M solution of silver nitrate.
Weight and volume measurements on a sample of pure cadmium showed its density to be 521 lb/ft3 is this a 3.5% error?
Based on the sign of E°cell, classify these reactions as spontaneous or nonspontaneous as written. Assume standard conditions.
The boiling point of the solvent and of the solution and the weight of the solute and solvent. The freezing point of the solvent and of the solution and the weight of the solute and solvent.
A sample of saturated magnesia is found to have [OH1-] = 3.22 x 10-4M. What is the pOH of the solution. Is magnesia acidic (A), basic (B), or neutral (N)
Draw a structural representation to describe the H-bonding responsible for the high boiling point of ethylamine and the structural representation of the H-bonding present when ethylamine dissolves in water.
0.25 mol of formic acid (HCO2H) is dissolved in enough water to make one liter of solution. The pH of that solution is 2.19. The Ka of formic acid is
Calculate the pH of a buffer solution (consisting of 30mL 1.0M NaA + 30mL 1.0M HA and a pH of 4.75) mixed with 2mL of 1.0M NaOH. (In class we got a calculated pH of 4.63 for the mixture of the buffer solution with 2mL 1.
A 20.0- sample of 0.125 HNO3 is titrated with 0.150 NaOH. Calculate the for at least five different points throughout the titration curve and make a sketch of the curve.
Using the rydeberg equation calculate the energy of the transition from lowest state, n=1, to the highest, n= infinity, for hydrogen atom.
What mass of CCl2F2 substance must evaporate in order to freeze 109 of water initially at 24 degrees celsius? (The heat of fusion of water is 334 J/g the specific heat of water is 4.18 J/gK .)
Name the enzymes and describe their mechanisms of action that help reshuffle disulfide bonds or catalyze the cis-trans peptide prolyl isomerization
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