7. When a monomer M was polymerized in solution with peroxide initiator P at two temperatures, using the same concentrations of M and P, the following conversions of M were obtained : Run Run #1 (50°C) Run #2 (65°C) Conversion in 60 min 20% 58% Initial molecular weight 100,000 60,000 Calculate the energy of activation (Ed) for the thermal decomposition of P.

7. When a monomer M was polymerized in solution with peroxide initiator P at two temperatures, using the same concentrations of M and P, the following conversions of M were obtained : Run Run #1 (50°C) Run #2 (65°C) Conversion in 60 min 20% 58% Initial molecular weight 100,000 60,000 Calculate the energy of activation (Ed) for the thermal decomposition of P.

Macroscale and Microscale Organic Experiments

7th Edition

ISBN:9781305577190

Author:Kenneth L. Williamson, Katherine M. Masters

Publisher:Kenneth L. Williamson, Katherine M. Masters

Chapter67: polymers: Synthesis And Recycling

Section: Chapter Questions

Problem 3Q

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When a peroxide P is heated to 60 ° C in an inert solvent, it decomposes bya first order process and 20% of the peroxide decomposes in 60 min. Polymerizes a bulk monomer using this initiator at 60 ° C, with an initial concentration of initiator equal to 4.0x10-4 mol / L. What fractions of the monomer and initiator should remain unconverted after 10 min? At 60 ° C, the system parameters are: kp2 / kt = 22.34 Lmol-1 s-1, f = 0.8.
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The acid-catalyzed hydrolysis of sucrose, C12H22O11 + H₂O + H+ -> C6H12O6 + C6H12O6 + H+ is known as "inversion of sucrose" because the angle, a, by which the solution rotates polarized light changes from positive to negative as the reaction proceeds (data from 30 degree C): t/hr a 0 78 2 71 4 12 18 24 42 65.10 44.60 32.40 22.45 2.30 48 -1.96 61 -9 86 95 -15.80 -17.25 -21.15 ∞ Use this data to show that the reaction is first order and determine its rate coefficient (at 30 degree C).
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