Mod1Less8

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University of Alberta *

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30

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Chemistry

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Feb 20, 2024

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4

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Chemistry 30: Module 1: Lesson 8 1 Assignment Booklet MODULE 1: LESSON 8 ASSIGNMENT (34 marks) Read all parts of your assignment carefully, and record your answers in the appropriate places. If you have difficulty with an assignment, go back to the textbook and review the appropriate lesson. Be sure to proofread your answers carefully before submitting your Assignment Booklet. Lesson 8 Assignment: Concepts from Lessons 6, 7, and 8 1. Calculate the enthalpy of reaction for the combustion of ethene. (5 marks) Hint: First write the balanced chemical equation for the reaction. 2. Use your answer from question 1 to answer the following questions. a. Express the enthalpy of reaction calculated in question 1 as a molar enthalpy of reaction per mole of carbon dioxide. (2 marks) b. Express the reaction enthalpy calculated in question 1 by writing it as a term in the balanced chemical equation. (2 marks)
Chemistry 30: Module 1: Lesson 8 2 Assignment Booklet c. Draw an energy diagram to describe the change in chemical potential energy that occurs in this reaction. Label important parts of your diagram. (2 marks) d. Indicate whether the reaction is exothermic or endothermic, and justify your answer by making reference to relevant concepts. (2 marks) 3. Use the information contained in “Lab Exercise 11.B” on page 506 in the textbook to answer the following questions. a. Use the reaction equations and reaction enthalpies shown in the introduction section to calculate the following: • a reaction enthalpy for the combustion of pentane (4 marks) • a molar enthalpy of combustion for pentane (2 marks)
Chemistry 30: Module 1: Lesson 8 3 Assignment Booklet b. Use the calorimetric data provided in the “Evidence” section to calculate a molar enthalpy of combustion for pentane. (3 marks) c. Calculate a percentage difference between the value calculated in question 2.a and the value calculated in question 2.b. (2 marks) 4. Use the information contained in “Lab Exercise 11.D” on page 513 in the textbook to answer the following questions. a. Use the data collected by experiment to calculate a molar enthalpy of reaction for methanol. (3 marks) b. Use the value calculated in question 4.a to calculate the standard molar enthalpy of formation for methanol. (5 marks)
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Chemistry 30: Module 1: Lesson 8 4 Assignment Booklet c. Calculate a percentage difference between the value calculated in question 4.b and the value for the standard molar enthalpy of formation for methanol shown in your Chemistry 30 Data Booklet. (2 marks) Submit your completed Assignment Booklet to your teacher at the end of this lesson.

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