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26-Kinetics-Graphical-Prob

# 26-Kinetics-Graphical-Prob - 0.0 sec – 0.0365 M 600 sec...

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CHEMICAL KINETICS GRAPHICAL RATE ORDERS GCHEM II LAB CONCEPT PROBLEMS [A] versus Time straight line: 0 th order slope = - k ln [A] versus Time straight line: 1 st order slope = - k 1/[A] versus Time straight line: 2 nd order slope = +k 1) A straight line graph developed when ln of concentration versus time was plotted for the decomposition of 2NO 2 (g) à 2NO(g) + 2O2(g) at 436 K. If the rate constant was 2.34 /sec, what is the reaction rate when concentration of NO 2 was 1.45 M. 2) Consider the decomposition of hydrogen peroxide: H 2 O 2 (l) à 2 H 2 O (l) + O 2 (g). When the ln [H 2 O 2 ] versus time was plotted, the result was a straight line. What is the rate law and what is reaction rate constant for the decomposition if reaction rate is 1.2 x 10 -3 M/sec and concentration of H 2 O 2 is 0.75M ? 3) Dinitrogen pentoxide decomposes as follows: 2N 2 O 5 à 4NO 2 + O 2. The concentration of N 2 O 5 as a function of time is as follows:
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Unformatted text preview: 0.0 sec – 0.0365 M, 600 sec – 0.0274 M, 1800 sec – 0.0157 M, 3000 sec- 0.00860 M, and 3600 sec – 0.00640. If concentration of N 2 O 5 is 0.0345 M, what is reaction rate ? 4) 1,3 butadiene is volatile above room temperature. Using the data list below to 1) determine order of the reaction with respect to 1,3 butadiene, 2) reaction rate law, and 3) rate constant : 0.0 sec 1.72 x 10 – 2 M, 900 sec – 1.43 x 10-2 M, 1800 sec – 1.23 x 10-2 M, 3600 sec – 9.52 X 10 –3 M, 6000 sec – 7.30 x 10-3 M. 5) See experimental data for the decomposition N 2 O 5 : 2 N 2 O 5 (g) à 4NO 2 (g) + O 2 (g). 0.0 sec/ 0.0045M, 200 sec/ 0.0074 M, 400 sec/ 0.0131 M, 600 sec / 0.0177 M, 800 sec/ 0.0256 M, 1000 sec/ 0.0333M, and 1200 sec/ 0.0454 M. What is the rate constant and reaction order for the decomposition ? jpechunf02/2005...
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