Test-exam 2

Substituting 14 consider the reaction 2 h 2 o2 2 h 2o

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Unformatted text preview: initial rate of disappearance of O2 ). b. 2 : 1* c. 1 : 2 d. 2 : 2 e. Insufficient information is given to answer this question. Ans. Let the disappearance of H 2 and O2 , and appearance of H2O be 1 2 H O H RD 2 RD2 1 RA 2O 2 H O H RD 2 , RD2 , RA 2O , then Therefore, O2 D R R 1 2 H 2O A or H R A 2O 2 O RD2 15. For the reaction 2A + B products, determine the overall order of the reaction given the following data [A]o (M) 0.10 0.20 0.30 0.20 0.30 a. 0 b. 1 c. 1.5 [B]o (M) 0.10 0.10 0.10 0.20 0.30 Init. Rate (M/sec) 2.0x10-2 8.0x10-2 1.8x10-1 8.0x10-2 1.8x10-1 10 d. 2* e. 3 16. The method that is used in the lab to determine the amount of ethanol present in a sample is based on the following two reactions: 2 3CH 3CH 2 OH 2Cr2 O 7 16H 3CH 3COOH 4Cr 3 11H 2 O K 2 Cr2 O 7 6FeC 2 H 2 NH 4 2 SO 4 2 • 4H 2 O 7H 2SO 4 3Fe 2 SO 4 3 2C2 H 4 NH 4 2 SO 4 K 2SO 4 Cr2 SO 4 3 5H 2 O It can be shown that when 10.00-mL 3.012 x 10-3 M of potassium dichromate (FW=294.185-g/mol) solution is mixed with 0.50-mL of 0.16%(w/v) ethanol (FW=46.06904-g/mol), the ferroin end point can be reached when 10.49-mL 1.061 x 10-2 M FEDS (FW=382.1478-g/mol) are added. Now, instead of 0.16%(w/v), suppose t...
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This note was uploaded on 03/03/2011 for the course CHEM 100A taught by Professor Dai during the Spring '06 term at UCSD.

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