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# HW3f10 - Homework 3 Due Tuesday 1 Calculate molecular...

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Homework 3 Due Tuesday, 9/28/10 1. Calculate molecular weight from the following viscosity data for polystyrene. You should provide a table showing your calculations of the different viscosities, a plot of the data to determine molecular weight, and the value for the molecular weight that you calculate. The values for K and a are: K=0.000113 dL/g, a=0.73 Some hints: The calculations will go quicker if you use a spreadsheet to calculate all the viscosities. You should also use an appropriate graphing program or calculator which will do linear regression in order to calculate the molecular weight. "Eyeballing" a line through a set of data points is not an acceptable means of finding the slope and intercept. c (g/dL) time (sec) 0.000 24.74 0.080 30.00 0.120 32.95 0.160 35.98 0.200 39.18 2. a. In analyzing a solution of poly(ethylene terephthalate), you find that all chains have one end which is an acid group, and that the total concentration of acid groups in the solution is 1.00x10 -3 mol/L. If the solution contains 25.0 g/L of polymer, what is the number average molecular weight of the polymer?

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HW3f10 - Homework 3 Due Tuesday 1 Calculate molecular...

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