Integrated Rate Law practices

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Dunman High School *

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Chemistry

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Nov 24, 2024

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CM1131 Tutorial 9 AY 18/19 CM1131 Tutorial 9 Question 1 a) Express the rate for the reaction N 2 + 3H 2 2NH 3 using each species respectively. b) The following two reactions are proposed as elementary steps in the mechanism for an overall reaction. i) Write the overall balanced equation. ii) Determine the molecularity of each step. iii) Write the rate law for each elementary step. Question 2 a) Calculate E a for a reaction for which the rate constant at room temperature (298 K) is doubled by a 10 °C increase in temperature. b) Calculate the room-temperature (298 K) ratio of the rate constants for two reactions that have the same A values but have E a values that differ by 10 kJ mol 1 . Question 3 Exam question 6(a) in AY 14/15 a) For the reaction 2A ± B, the following data were obtained when [A] 0 = 8.00 mmol L 1 . Time / s 0 70 211 492 [B] / (mmol L 1 ) 0 2.00 3.00 3.50 i) Calculate [A] at each time interval. ii) Determine the order of reaction using the half-life method. Show your reasoning. CM1131 Tutorial 9Page 1
CM1131 Tutorial 9 AY 18/19 Question 4 (4a will be covered in week 12) a) At the appropriate condition, the reactant A undergoes three parallel reactions, where P 1 , P 2 and P 3 are the products: The rate constants at 22 °C are k 1 = 7.0 10 4 s 1 , k 2 = 4.1 10 3 s 1 and k 3 = 5.7 10 3 s 1 . What × × × is the percent yield for P 1 formation? b) The interconversion of the “chair” and “boat” conformation of cyclohexane is shown below. The reaction is first order in each direction. The rate constants in a given solvent at 25 °C are k 1 = 2.75 10 4 s 1 and k 1 = 4.34 10 8 s 1 . What is the equilibrium constant at 25 °C? × × CM1131 Tutorial 9Page 2
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