The rate of a chemical reaction a is constant at any

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General, Organic, & Biological Chemistry
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Chapter 8 / Exercise 8-48
General, Organic, & Biological Chemistry
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53. The rate of a chemical reactionAis constant at any given temperature regardless of other factors.B)is independent of the amount of contact surfaceof a solid involved.C)between gases should in all cases be extremely rapid because the average kinetic energy of themolecules is great.Dis approximately doubled for a 10°C rise in temperature.E)varies inversely with the absolute temperature.
54. If ∆H = 110 kJ/mol for a certain process, then
55. The gas-phase decomposition of N2O5is a first-order process with a rate constant of 1.50 x 10-3s-1at 55°C. The decomposition reaction is: N2O5(g)  2NO2(g) + 2O2(g)If 10.0 g of N2O5are placed in vessel 1 and 5.0 g of N2O5in vessel 2 and the vessels are at thesame temperature (55°C) and the same pressure, how much time is required for half of the N2O5to decompose in each vessel?1
56. Given the following information: 21N2O4(g)  NO2(g∆H = 28.6 kJ for one mole of NO2at 30°C, k= 5.1 x 106 /s, and the activation energy is 54.0 kJ/mol. This reaction is)
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General, Organic, & Biological Chemistry
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Chapter 8 / Exercise 8-48
General, Organic, & Biological Chemistry
Stoker
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Baillie and Fajardo CHEM 104 Practice Problem Setendothermic
57. Which of the following statements is/are FALSEconcerning the order of a reaction? 1. can be deduced from the stoichiometry of the reaction 2. gives the reaction mechanism3. is determined experimentallyA) 1 only B) 2 only C) 3 only D) 1 and 2 only E) 2 and 3 only
58. Which of the following is/are FALSE concerning a catalyst and a chemical reaction?1. It changes the stoichiometry. 2. It decreases the activation energy.3. It provides an alternate reaction mechanism.
59. The activation energy for a reaction can be changed by1. adding more reactants. 2. adding a catalyst.3. providing another reaction pathway.
60.188W decays by first order with a t1/2= 69 days. After how many days will the initial amount of the reactant to be at 12.5%?
E) 276 d61. Thyroxine, an important nonelectrolyte hormone that controls the rate of metabolism in the body, can be isolated from the thyroid gland. If 0.455 g of thyroxine is dissolved in 10.0 g of benzene, the freezing point of the solution is 5.144°C. Pure benzene freezes at 5.444°C and has a Kfof 5.12°C/m. What is the molar mass of thyroxine in g/mol?

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