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General Chemistry for Engineers

by: Sylvester Sauer

General Chemistry for Engineers CHEN 1211

Sylvester Sauer

GPA 3.92


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Class Notes
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This 3 page Class Notes was uploaded by Sylvester Sauer on Thursday October 29, 2015. The Class Notes belongs to CHEN 1211 at University of Colorado at Boulder taught by Staff in Fall. Since its upload, it has received 24 views. For similar materials see /class/231948/chen-1211-university-of-colorado-at-boulder in Chemical Engineering at University of Colorado at Boulder.

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Date Created: 10/29/15
Chen 1211 Exam 3 Review 111307 1 The following data was obtained for the reaction A B C products Determine the values of a B and v in the rate equation Rate kA BBCV 2 Arrange the following in order of increasing boiling points CHSCHZOH CH3CH2CH3 H3CCC3 CH3CH3 II III IV a Vltltlt b ltVltlt c ltltVlt d Vltltlt 3 Formic acid HCOZH is an organic acid secreted by ants and stinging nettles Calculate the pH in a 020 M HCOzH solution The dissociation constant for HCOzH is Ka 18 x 104 a 176 b 198 c 222 d 258 e 329 4 The air pollutant NO is produced in automobile engines because of the high temperature reaction N2g 02g a 2NOg The equilibrium constant for this reaction is Kc 17 x 10393 at 2300K If the initial concentration of N2 and 02 at 2300K are both 140M what is the concentration of NO when the reaction mixture reaches equilibrium a 00024M b 0056M c 011M d 044M e 14M 5 A solid compound A dissociates into gases B and C at 50 C according to the reaction below As a 3B9 Cg If sufficient amount of the solid A is sealed in a flask then the total pressure is 0250 atm at equilibrium What is the value of Kp at 50 C a 153 x 10395 b 412 x 10394 c 165 x 10393 d 117 x 10392 e 105 x 10391 6 What is the hydroxide ion concentration of a lye solution that has a pH of 1120 Assume that lye is a strong base a 631 x 103912 M b 200 x 103911 M c 731 x 10394 M d 158 x 10393 M e 1120 M 7 Consider the reaction 2A B 2C When the concentration ofA is doubled the rate for the reaction quadruples When the concentration of B is doubled the rate remains the same Which mechanism below is consistent with the experimental observations a Step 1 A B a D fast equilibrium Step 2 A D 2C slow b Step 1 2A a D fast equilibrium Step 2 B D E slow Step 3 E 2C fast c Step 1 A B D slow Step 2 A D a 2C fast equilibrium d Step 1 2A D slow Step 2 B D E fast Step 3 E 2C fast Answers 1 Alpha 2 beta 12 gamma 0 2 d 3 c 4 b 5 b 6 d 7 d 8


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