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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
Arrange the bases in increasing order of strengths. I) deuterated ammonia (ND3) Kb = 1.1 × 10?5 II) hydrazine (NH2NH2) Kb = 1.7 × 10?6 III) ammonia (NH3) Kb = 1.8 × 10?5
What is the pH of the rainwater assuming all the sulfuric acid is in the liquid water droplet? Hint: The "per m3" means per m3 of air for both [H2SO4] and the cloud liquid water.
solution has a transmittance of 0.309 in a 1.00 cm cell at 520 nm. Calculate the molar absorptivity of the solution.
A patient with type I diabetes has come to the emergency room with ketoacidosis. which of the following would help to explain her high blood pressure
a gas cylinder witha volume of 3.00 dm^3 contains 8.00 moles of oxygen gas at a temperature of 50.0k. what is the pressure inside the cylinder.
The precipitate was filtered, dried, and weighed. A total of 1.55 g calcium flouride was collected. What was the percentage of CsF in the original sample.
How many moles of PbI2 are formed? What is the concentration of KNO3? What is the remaining concentration of the reactant that was in excess?
When Copper (II) sulfate is prepared from copper (II) nitrate and sodium sulfate, the reaction initially produces a hydrated product: Cu(NO3)2 + Na2SO4 + 5H2O yield CuSO4 x 5 H2O + 2 NaNO3
How many grams of methane gas (CH4) are in a 15.8 liter sample at 1.2 atmospheres and 27°C? Show all work used to solve this problem.
The amount of lead in a aqueous sample is determined by atomic absorption spectrometry. Two standard solutions are prepared and used to make a calibration curve, and then the absorbance of the sample is measured.
The liquid vaporizes quickly to gaseous nitrogen (which has a density of 1.15 g/mL at room temperature and atmospheric pressure) when the liquid is removed from the tank.
how many atoms of oxygen per second are colliding with each square centimeter of the surface? The residual gas in the system has the same composition as air, and the temperature is 295K
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