chem_126_common_1_2010_A00NSWERS_szzz1

chem_126_common_1_2010_A00NSWERS_szzz1 - Feb. 26, 2010...

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Feb. 26, 2010 Chemistry 126 Common 1 1) Questions 1-2. The natural log of the reactant concentration is plotted versus time and produces a straight line. What is the order of the reaction? A. 0 B. ½ C. 1 D. 2 E. 3 For 1 st order: ln[ R] = ln[R] o –kt 2) What is the numerical value of the rate constant? A. 0.0050 B. 0.010 C. 0.015 D. 0.020 E. >1 3-4) The table gives the experimental data for the reaction: A(g) + 2B(g) C(g) at 850 K. 3) What is the order of the reaction with respect to A? A. 0 B. ½ C. 1 D. 2 E. 3 From runs 1 and 2, when [A] is doubled rate is 4 times larger. 4) What is the overall order of the reaction? (You first need to find the order with respect to B.) A. 0 B. 1 C. 2 D. 3 E. 4 2 3 2 0.0378 0.15 0.66 4.5 ; 2 4.50 / 2.25 2 0.0084 0.10 0.33 x x Rate k Rate k   = = = = =     So, the reaction is first order with respect to B. The overall reaction order = 2+1 = 3 5) The table gives the experimental data for the reaction: A(g) 2B(g) at 1050 K. What is the rate constant in M/hr ? A. 0.050 M/hr B. 3.3 M/hr C. 10. M/hr D. 20. M/hr E. 0.30 M/hr Run [A] (M) [B] (M) Rate (M/s) 1 0.05 0.33 2.10 x 10 -3 2 0.10 0.33 8.40 x 10 -3 3 0.15 0.66 3.78 x 10 -2 Run [A] (M) Rate (M/sec) 1 0.15 0.0055 2 0.40 0.0055 3 0.90 0.0055 ( 29 1 1.16 0.6 0.015 38 0 k slope hr hr hr - - - - = - = - = - 0 1 As the [A] changes, the rate stays the same. So, the reaction is 0 order with respect to [A]. [ ] 0.0055 3600 19.8 20. / Rate k A k M s k Rate x M hr s hr = = = = =
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6) The reaction for the decomposition of A is: 2A(g) 3B(g) + C(g). At a certain temperature, the concentration of A is 0.040 M. 95 s later its concentration is 0.025 M. What is the average rate of change of B for this time interval? A. -7.9x10 -5 M/s B. 7.9x10 -5 M/s C. 1.6x10-4 M/s D. 4.8x10 -4 M/s E. 2.4x10 -4 M/s 7) Under certain conditions when excess solid phosphorus reacts with chlorine gas, phosphorus trichloride gas is the principle product. It is easy to monitor the total pressure. However, the chlorine pressure is needed to measure the rate. The initial chlorine pressure is 800 torr. What is the chlorine pressure when the total pressure is 650 torr? A. <310 torr B. 350 torr C. 400 torr D. 450 torr E. >490 torr 8) The above reaction is exothermic and is at equilibrium at 2000 K. To increase the equilibrium yield of PCl 3 which of the following is correct? A. Add more P. B. Increase the total pressure by decreasing the volume of the container. C.
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This note was uploaded on 11/09/2010 for the course CHEM Chem taught by Professor Petrova during the Spring '09 term at NJIT.

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chem_126_common_1_2010_A00NSWERS_szzz1 - Feb. 26, 2010...

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