2C Exam 2 problems 10&12

2C Exam 2 problems 10&12 - First note that the...

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From Dr. Toupadakis's Chem 2C Miderm 2 Fall 2010 #10 is derived from the ideal gas law and is related to the reason we can use pressure and concentration interchangibily for activities and such. PV = nRT P RT = n V = mol L = M Therefore P is proportional to concentration with 1/RT as the proportionality constant. The units of Reaction Rate are M t so in terms of pressure, it must be P RT t or P RT t . #12 is an unfamiliar presentation of kinetic data that really tests the conceepts of chemical kinetics. I know Dr Toupadakis was particularly proud of this problem. It requires a really good understanding of the concepts, but the calculation itself is really simple.
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Unformatted text preview: First note that the initial rate follows the line drawn diagonally across the graph. The line is labeled as being at a 45 degree angle with the x-axis. That means the rise eqquals the run and the slope, [ A ] s , equals one, so the initial rate is 1 M/s. You are given k and from the units you should be able to tell it is a 2 nd order reaction. So the rate law is Rate = k [ B ] 2 . If you substitute in the information you know: 1 M s = 0.25 M − 1 s − 1 [ B ] 2 1 = 1 4 [ B ] 2 [ B ] 2 = 4 [ B ] 2 = 2 M...
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