PHC320H1 Lecture Notes - Lecture 26: Reaction Rate Constant, Gas Constant
24 Mar 2015
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Will only mark 1 question out the set grade will be based on that. Place in drop box (undergrad) near reception. Due on: february 28, 2012 at 5pm. Performulation = initial investigation of physical and chemical characteristics of a drug e. g. drug stability, solubility, melting point. Question 1: determine half-life and time it takes to decompose to 90%. = 0. 693/1. 42x105s = 4. 5x106 s-1 (b) find time it takes to decompose to 90%. First order reaction: y = mx + b log [a] = log [a]o (kt/2. 303) where, y = log [a] From the graph, we know: log [a]1 = -0. 506 and t1 = 0 min log [a]2 = -1. 237 and t2 = 50 min. Question 3: determine arrhenius factor (a) in l/mol s and ea in kj/mol from the temp-dep. Assume ea is temperature-dependent. (r = universal gas constant) k = ae-ea/rt.
