d Calculate the decomp rate at 800K at the instant when CH 3 CHO 0250 4 In

# D calculate the decomp rate at 800k at the instant

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d) Calculate the decomp. rate at 800K at the instant when [CH 3 CHO] = 0.250
4. In lecture, we said that as a rule of thumb, if we increase the temperature of a reaction by 10 o C, the rate will double. What is the value of the activation energy, E a, that makes this statement exactly correct for a reaction run at 25 o C and 35 o C? 5. The activation energy, E a , for a reaction is exactly 100kJ/mol. At what temperature must the reaction be run, for the rate to exactly double compared to the rate at 25 o C?
6. The half-life for the reaction 2 N 2 O 5 4 NO 2 + O 2 is 2.4 hours at 30 o C. a) Starting with 10 g of N 2 O 5, how many grams will remain after a period of 9.6 hours? b) Starting with 100 g of N 2 O 5, how many grams will remain after a period of 16 hours? c) What period of time is required to reduce 5.0x10 10 molecules of N 2 O 5 to 1.0x10 8 molecules?
7. For the reaction A + B C the following data are obtained at 25 o C: Initial [A] Initial [B] Initial Rate 1.0 M 1.0 M 3x10 -2 0.1 M 1.0 M 3x10 -3 1.0 M 0.1 M 3x10 -4 a) What is the rate law for the reaction? b) What is the numerical value for the rate constant? c) Speculate on a reasonable equation for the rate determining step. d) When the first experiment is performed at 50 o C, the initial rate is 3x10 -1 . What is E a for this reaction?
8. The reaction A + B C + D is exothermic by 100 kJ/mol and has an activation energy, E a , of 50 kJ/mol. Make a plot of Energy vs Reaction Coordinate that contains this information. Label it appropriately.
9. A reaction is run and the following data is obtained: Time (yr) [A] (moles furlong -3 ) 0 0.15 2 0.099 4 0.073 6 0.047 8 0.028 10 0.022 a) What is the order of the reaction with respect to A? b) Show a plot of the data proving your contention.

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